Hamilton's first season in Formula One saw him partner two-time and defending World Champion Fernando Alonso. Hamilton is the first and, as of August 2022, the only black driver to race in the series. After finishing on the podium in his debut, Hamilton went on to set several records as he finished runner-up in the 2007 World Drivers' Championship to Kimi Räikkönen by one point, including those for the most consecutive podium finishes from debut (9), the joint most wins in a debut season (4) and the most points in a debut season (109). Throughout the season, Hamilton and Alonso were involved in a number of incidents which resulted in tensions between both drivers and the team, culminating in Alonso and McLaren terminating their contract by mutual consent in November. Following a successful first season at McLaren, Hamilton signed a multi-million-pound contract to stay with the team until 2012.
Hamilton's success continued in 2008 as he amassed five victories and ten podium finishes. As the season reached its conclusion in Brazil, it became a clear two-way fight for the title between the home favourite Felipe Massa and the young Briton. Hamilton won his first title in dramatic fashion in the last race of the season, the 2008 Brazilian Grand Prix, overtaking Timo Glock for fifth position in the final corners of the last lap to become the then-youngest Formula One World Champion in history and to deny race-winner Massa the title by one point. This made Hamilton the first British driver to win the World Championship since Damon Hill in 1996.
In his last four years with McLaren, Hamilton continued to score podium finishes and race victories. Hamilton entered the final round of the 2010 season with a chance of winning the title, but ultimately finished fourth as Sebastian Vettel won the race to take his maiden drivers' crown. The following year was the first season he had been out-scored by a teammate, as Jenson Button finished runner-up to champion Sebastian Vettel, during a year in which distractions in his private life and run-ins with FIA officials saw Hamilton finish a lowly fifth in the standings, after which he vowed he would return to form for 2012. Hamilton achieved four race-wins in the 2012 season as he finished fourth in the standings. Before the end of the year, Hamilton announced, to much surprise, that he would be joining Mercedes for the 2013 season, replacing the retiring Michael Schumacher.
2013–2016: Teammates with Rosberg Upon signing with Mercedes in 2013, Hamilton was reunited with his childhood karting teammate, Nico Rosberg. The move was met with surprise by pundits and the public, with some describing the move to Mercedes, a team with no recent history of success, as a gamble. In his first season with the Silver Arrows, Hamilton secured a sole race victory, winning the Hungarian Grand Prix, where he converted an unexpected pole position into a winning margin of over 11 seconds ahead of second-place finisher Kimi Räikkönen, alongside a number of podium finishes and pole positions, finishing fourth in the standings once again, the third time in five years.
Changes to regulations for the 2014 season, which mandated the use of turbo-hybrid engines, contributed to the start of a highly successful era for Hamilton. That year saw Mercedes win 16 of the 19 races that season, 11 of those secured by Hamilton as he prevailed in a season-long duel for the title against teammate Rosberg. Clinching his second drivers' title, and eclipsing the victory tally of all British drivers before him, Hamilton declared over team-radio after the final race in Abu Dhabi: "This is the greatest day of my life." New driver number regulations brought in for 2014 allowed drivers to pick a unique car number to use for their entire career, and so Hamilton elected to drive under his old karting No. 44 for the remainder of his career.
Before the start of the 2015 season, Hamilton announced he would not be exercising his option of switching his car number to 1, as was his prerogative as reigning World Champion, and would instead continue to race with his career No. 44. It was the first season since 1994, when Alain Prost retired from the sport following his fourth and final World Drivers' Championship title in 1993, that the field did not contain a car bearing the No. 1. Hamilton dominated the 2015 season, winning ten races finishing on the podium a record seventeen times as he matched his hero Ayrton Senna's three World Championships titles. The rivalry between him and Rosberg intensified, climaxing in a heated battle at the US Grand Prix where Hamilton won in an action-packed, wheel-to-wheel battle with his teammate to clinch the title with three races to spare. That year, Hamilton extended his contract with Mercedes for three additional years in a deal reportedly worth more than £100 million, making him one of the best-paid drivers in Formula One, as well as allowing Hamilton to retain his own image rights, which is considered unusual in the sport, and keep his championship-winning cars and trophies.
Despite recording more pole positions and race wins than any other driver in 2016, Hamilton lost the drivers' title by five points to his teammate, Rosberg. The team's policy of letting the pair fight freely led to several acrimonious exchanges both on and off the track, culminating in Hamilton defying team-orders at the season finale in Abu Dhabi and deliberately slowing to back Rosberg into the chasing pack at the end of the race in an unsuccessful bid to encourage other drivers to overtake his teammate, which would have allowed him to win the title.[60] Ultimately, a succession of poor starts from Hamilton early in the season and a crucial engine blowout in Malaysia meant Rosberg took the title, which he successfully secured before announcing his shock retirement from the sport immediately after beating his rival.
2017–2020: Four titles in a row Following Rosberg's retirement, Ferrari's Sebastian Vettel became Hamilton's closest rival as the pair exchanged the championship lead throughout 2017 in a tense title fight. Hamilton registered 11 pole positions that season as he took the record for the all-time most pole positions, and his consistency (finishing every race in the points), as well as a lack of a serious challenge from his new teammate Valtteri Bottas, saw him record nine race victories and secure his fourth World Drivers' title as he overturned a points deficit to Vettel in the first half of the season, ultimately wrapping the title up in Mexico with two races to spare.
The 2018 season was the first time that two four-time World Champions, Hamilton and Vettel, would be competing for a fifth title and was billed as the "Fight for Five" by journalists and fans. As with the season before, Ferrari and Vettel appeared to have the upper hand for much of the season, topping the standings until the half-way point. However, Vettel's season unravelled with a number of driver and mechanical errors, while Hamilton's run of six wins in seven in the latter half of the season saw Hamilton clinch the title in Mexico for a second year running as he set a new record for the most points scored in a season (408). During the season, Hamilton signed a two-year contract with Mercedes, reported to be worth up to £40 million per year, making him the best-paid Formula One driver in history.
Having signed a contract with Mercedes that lasted until 2020, it was confirmed Hamilton would defend his title in 2019. Hamilton led the drivers' standings for the majority of the season, fending off title challenges from team-mate Bottas, the Honda-powered Red Bull of Verstappen and Ferrari's recently promoted Leclerc, to clinch his sixth drivers' crown at the 2019 United States Grand Prix with two races remaining. After scoring his sixth career grand slam in the final race of the season, Hamilton ended the season with 11 wins (matching his previous best in 2014 and 2018) and 17 podiums (matching the all-time record for a fourth time) as well as achieving 5 pole positions. His total of 413 points for the season was a new all-time record, seeing the Briton finish 87 points clear of second-placed Bottas.
Hamilton won his seventh drivers' title in 2020, equalling the record set by Schumacher, in a season heavily impacted by the COVID-19 pandemic. Over the shortened seventeen-race season, Hamilton took 11 wins (equalling his previous personal best, but in fewer races) including one in Portugal to break Schumacher's record of 91 wins. He also took 14 podiums and 10 pole positions. Hamilton missed the 2020 Sakhir Grand Prix after contracting COVID-19 and replaced to Mercedes test driver George Russell, originally planned replace to Stoffel Vandoorne or Jack Aitken, his first race absence since his debut in 2007. Hamilton clinched the title at the 2020 Turkish Grand Prix with three rounds to spare and ended the season 124 points clear of his team-mate, Bottas, who finished second in the standings. Amid Formula One's We Race as One campaign and growing global support for the Black Lives Matter movement, Hamilton took the knee ahead of every race he entered and wore t-shirts bearing the Black Lives Matter slogan. Hamilton and Bottas' W11 cars also sported a black livery as a statement of Mercedes' commitment to diversity.
2021 season: Title battle vs. Verstappen and century of wins Early on in the 2021 season, Hamilton and Red Bull's Max Verstappen emerged as title favourites. The pair frequently exchanged the championship lead throughout the season—often sparring (and occasionally coming together) on track—and entered the last race in Abu Dhabi level on points. In Abu Dhabi, Verstappen overtook Hamilton on the final lap of the race, denying Hamilton his eighth title. During the season, Hamilton became the first driver to surpass 100 pole positions and 100 race wins, respectively.
The season finale was marred by controversy over race director Michael Masi's decision to instruct only the lapped cars separating Verstappen and Hamilton to un-lap themselves under the safety car, which eliminated any gap between the pair and allowed the Dutchman, running newly fitted soft tyres, to enter the final lap immediately behind Hamilton on his worn hard tyres. Four days after the race, the FIA announced that it would conduct an internal investigation into the incident. Masi was subsequently removed from his role as race director, with the FIA World Motor Sport Council report finding that "human error" resulted in the failure to follow Formula One Sporting Regulations concerning the withdrawal of the safety car, but also that the final standings "are valid, final and cannot now be changed." Notwithstanding the controversy in Abu Dhabi, BBC Sport's Andrew Benson described the season as "one of the most intense, hard-fought battles in sporting history", with Hamilton and Verstappen having "been head and shoulders—and a lot more—clear of every other driver on the grid."