Per Mertesacker

In August 2006, Mertesacker moved to Werder Bremen in a €5 million transfer deal after a highly impressive performance in the 2006 World Cup, in which Germany finished third. At the time of his transfer, he and Brazilian midfielder Diego, who joined from Porto, were jointly Bremen's most expensive signings in the club's history. Despite missing the first month and a half through an injury sustained at the World Cup, he quickly made the centre-back position his own upon his return to the starting eleven. In November, he scored his debut Champions League goal in a 1–0 win over Chelsea to end the Premier League winners' unbeaten streak in the season's competition. Upon his first return to the AWD-Arena for the first game of the second half of the season, he refused to celebrate after scoring against his boyhood club.

The 2007–08 season was a mixed bag for Mertesacker. He started in nearly all of Bremen's league and European fixtures and received his first red card in his professional career in a 6–3 loss against VfB Stuttgart. Bremen finished runners-up in the league winning only two games fewer than champions Bayern Munich and managed to seal a place in the next season's Champions League. At the end of the season, he signed a two-year extension to his original contract.

After returning from the Euro 2008, Mertesacker again missed the beginning of the new season with a knee injury and through illness. In September, he returned to the starting line-up. He scored the opening goal in the DFB-Pokal semi-final away at northern rivals Hamburger SV to break the deadlock after a goalless first half, but the home side equalised, forcing the match into extra time and Bremen eventually triumphed 4–2 on penalties. He was ever present for the rest of the season until injury forced him off in the UEFA Cup semifinal second leg against Bundesliga rivals Hamburg. It was later revealed that he had torn ligaments in his right ankle and required surgery. He was ruled out for the rest of the season, as well as the UEFA Cup final loss against Shakhtar Donetsk and DFB-Pokal final, which they won. He scored four goals in all competitions, including a crucial equalizer against VfL Wolfsburg.

Mertesacker began the 2009–10 season well with a 5–0 win over FC Union Berlin in the 2009–10 DFB-Pokal, the first game of the season. In October, he scored his first goal of the season in a 2–0 win against 1899 Hoffenheim and a last-minute equalizer in the clash against table-toppers Bayer Leverkusen in February. He played 33 Bundesliga matches in total, scoring five goals in the process.

In the 2010–11 season, Mertesacker made 30 Bundesliga appearances, scoring two goals. He averaged 46.3 passes per game, the third-highest in the Bremen squad, and the second highest pass success rate, with 82%, demonstrating another facet of his game.

Over the course of his final two seasons at Bremen, Mertesacker received just one yellow card in 63 league matches. He averaged less than one foul per game, cementing his reputation as an astute reader of the game, defying critics' predictions that his height would render him clumsy and having a tendency to frequently concede fouls.

On 31 August 2011, Arsenal confirmed they had signed Mertesacker on a four-year contract. He was presented the number 4 shirt previously worn by former team captain Cesc Fàbregas. In his first month at the club, Mertesacker started in every one of his available league and European matches since his summer move, battling on through the month with various defensive partners as injury problems mounted. "I want to do a good job, especially in the defence," he said. "That is my role. If the coach praises me then that is a great thing but I have to go on and keep on working." In November, he enjoyed a positive month at the heart of the Arsenal defence as he developed his partnership with fellow defender Laurent Koscielny. The Germany international helped the Gunners to victories against Sunderland, Stoke City and Chelsea – and was outstanding as Arsenal kept a clean sheet in the away victory in Marseille. He remained an integral part of Arsène Wenger's first team, playing in every one of Arsenal's available Premier League fixtures over the next month. He was virtually ever-present over January, missing only the FA Cup victory over Leeds United through illness.

In February, Mertesacker suffered an ankle injury in the win over Sunderland away at the Stadium of Light and faced a long-term spell on the sidelines. Prior to his injury, he featured in the draw at Bolton Wanderers and the 7–1 victory over Blackburn Rovers at Emirates Stadium. "Unfortunately he has had surgery and we have lost him for a while," said Arsène Wenger. "How long, I don't know. He had reconstruction of his ligaments. So it will be long term." He had not featured for Arsenal for the remainder of the season.

In his second season, Mertesacker played in Arsenal's first two matches, helping the team keep clean sheets against Sunderland and Stoke. "I think we have a better situation than last year," he said. "The team is full of characters, good players and every position [has competition]." He featured four times in September, forging a fine partnership with Thomas Vermaelen (who replaced Koscielny due to injury) in the process. The German centre back was named man of the match after an excellent performance in a 1–1 draw with Manchester City at the Etihad Stadium.

In October, Mertesacker continued to perform well, making four appearances and helping the club to victories over Norwich City and Queens Park Rangers. Laurent Koscielny praised the German's performances, saying, "I am happy for Per because he's a nice guy, very important in the dressing room. He's a joker so he's good for the team. I'm happy because he's played well this season and it's good for the team." Mertesacker was an ever-present throughout November. He scored his first goal for the club in the 5–2 win over Tottenham Hotspur and was voted man of the match for his performance in the 0–0 draw with Aston Villa. "It was amazing from the very start," he told Arsenal after the Tottenham game. "It was very good to score because we were one man up and they were dropping off. I kept standing in the box and tried to be lucky. The ball from Theo [Walcott] was very good and it was a good day to score."

Mertesacker made five appearances in December, missing only the trip to Olympiacos in the Champions League and the home win over Newcastle United. On being drawn against Bayern Munich in the Champions League round of 16, he said, "We will face a good team in Germany. They are top of their league and went through to the knockout stage in a phenomenal way. They only conceded seven goals in the first half of the season. [But] they have a little break now and can rest a bit. Maybe it's a good opportunity for us to face them in February because we will be in our rhythm. We will hopefully go through the Christmas period in a strong way. We can do that." Mertesacker captained Arsenal for the first time in the FA Cup win over Brighton & Hove Albion in January, and appeared in every game save for the draw at Southampton on New Year's Day. "We are always looking to win something and we can achieve something with this group," he told Arsenal. "We have a lively group so our thoughts are now on the next match. That's the most important thing for us, not what's going to happen in May. We have a few targets in our team that are possible this year. We won't talk about it, we'll just see what happens in the next few important weeks on the pitch." Mertesacker started four games in February, missing only the FA Cup loss to Blackburn at the Emirates. "It's always special to face a German team," the defender said ahead of the Champions League tie against Bayern. "[Me and Lukas Podolski] are looking forward to it because Bayern are a great team and are so consistent this year. It's a special game for German players to play against a team from their home country."

Mertesacker was a mainstay in March, playing every single minute of Arsenal's four games. The centre back was on target in the defeat at Tottenham and was a key component in the defence that kept clean sheets against both Bayern Munich and Swansea City. "It rained cats and dogs, especially in the second half," he said after the win in south Wales, in Swansea. "It was very slippery but it was a vital win." In April, Mertesacker was shown a red card at West Bromwich Albion in the first game of the month. The defender returned to the team after suspension and was named man of the match against Fulham after scoring the only goal away at Craven Cottage. "I think they've been terrific – not only defending very well but also creating goals for us at the other end like they did last week against Fulham," said goalkeeper Wojciech Szczęsny on the partnership between Mertesacker and Koscielny. "They're getting the credit they deserve because they work very hard and they're very honest lads. I'm very happy for them and it's much easier to play behind them when they are in that kind of form."

Mertesacker impressed at the back alongside Koscielny in May. The German defender was given the captain's armband in Arsenal's last game of the season when Mikel Arteta went off injured. "I think it is good for us to play against teams who are under pressure," he said after the win against Queens Park Rangers [who were on the brink of relegation]. "It helps us keep our focus on a high level."

Mertesacker was named as the temporary captain of the side after injuries to Thomas Vermaelen and Mikel Arteta at the beginning of the 2013–14 season. He scored his first goal of the season against Stoke following a free-kick from compatriot Mesut Özil. After his man of the match performance away to Borussia Dortmund in the Champions League helped Arsenal to a 1–0 win, Mertesacker's influence was cited as a significant factor in Arsenal's excellent start to the 2013–14 season, which saw the team leading the Premier League at the end of November. As Mertesacker's great run continued, he was voted as a part of the Premier League Team of the Year, along with teammate Aaron Ramsey. On 13 January 2014, Mertesacker made his 100th official appearance for the Gunners in a 1–2 away win over Aston Villa. On 4 March 2014, Mertesacker signed a new contract with Arsenal.

On 12 April 2014, Mertesacker scored an 82nd-minute equalising goal for Arsenal in the FA Cup semi-final against Wigan Athletic. The match finished 1–1 after extra time, with Arsenal winning 4–2 in a penalty shootout. He had earlier conceded the penalty that had put Wigan 1–0 up. On 17 May 2014, Mertesacker started in the 2014 FA Cup Final as Arsenal beat Hull City 3–2 at Wembley Stadium.

After initially featuring sparingly due to injuries in the 2014–15, he returned to captain Arsenal in the 2015 FA Cup Final at Wembley in a 4–0 victory over Aston Villa. He scoring the third goal, a header, during the second half.

After healing from injury, Mertesacker remained a mainstay in the Arsenal backline, playing alongside Laurent Koscielny. With Arsenal making a charge towards the title, Arsène Wenger singled out Mertesacker for praise, calling him an "important leader in the dressing room and a respected one". On 24 January 2016, in a match against London rivals Chelsea, Mertesacker was sent off after 18 minutes for a late tackle on Diego Costa, who later scored the only goal of the game at Emirates.

However, he sustained an injury against Lens in the 2016–17 pre-season, undergoing knee surgery in his native Germany later that month. Following a clash between Arsenal and Viking, Arsène Wenger confirmed that Mertesacker would be absent until December. Despite the injury he was named club captain following the retirement of Mikel Arteta. He was a second-half substitute on the last day against Everton. On 27 May 2017, Mertesacker made his only start of the season, in the FA Cup final against Chelsea, which Arsenal won 2–1. He made a number of important tackles during the match and his performance was praised by opposition manager Antonio Conte, who stated that Mertesacker was a "perfect example for any young professional football player," adding that "what he did today was just a consequence of an unbelievable attitude every day."

Arsenal later confirmed the 2017–18 season would be Mertesacker's last, before becoming the head of the club's academy the following year. On 7 January 2018, Per Mertesacker captained the Arsenal team in an FA Cup game away against Nottingham Forest and scored a goal to make the score 1–1, with the game eventually finishing 4–2 to Forest, before featuring in his last ever game for the club in a 5–0 win against Burnley on 6 May 2018.

During the 2014 World Cup qualification campaign, Mertesacker contributed two goals and also re-established himself as first-choice centre back following a long-term injury to Badstuber in the middle of the 2011–12 season, often partnering either Hummels or Jérôme Boateng. He was called up for the final World Cup squad and played in all but one of the matches during Germany's successful run to the final, as well as reaching his 100th cap during the group stage match against Ghana. On 15 August 2014, Mertesacker announced his retirement from international football.

During the 2014 World Cup Mertesacker became an internet sensation after a video of his live post-match interview was uploaded on YouTube and went viral, amassing over 28 million views as of June 2015. After the narrow extra-time win over Algeria in the 2014 World Cup round of 16 Mertesacker, who was visibly exhausted and reportedly already in a foul mood, was taken aside to conduct an impromptu interview with ZDF reporter Boris Büchler and subsequently questioned about the German defensive line's "cumbersome and vulnerable" performance against their opponents. He defended his teammates before brusquely retorting, "What do you want from me? [...] I'll lie down in the ice bath for three days and then we'll analyze the game in peace.", leading the interview to be dubbed the "Ice Bath Interview" (Eistonnen-Interview) by the German press and amused fans. Despite the uncharacteristic outburst, Mertesacker, being a popular figure with fans, was widely praised by viewers and applauded by his teammates for candidness; Büchler himself was also praised for not being afraid to ask "tough questions" and he later clarified that he and Mertesacker were actually on friendly terms. Several days later Mertesacker uploaded a picture of himself in an ice bath on his Twitter account as a tongue-in-cheek response. German magazine 11 Freunde created and uploaded a mash-up video of Mertesacker's interview with Vanilla Ice's Ice Ice Baby on its website while German comedian Oliver Pocher and 1. FC Köln players parodied the interview. Journalist Raphael Honigstein and national team manager Oliver Bierhoff both retrospectively noted that the infamous interview was a turning point for the squad psychologically.