March 21 - former Indianapolis Colts quarterback Peyton Manning signs a 5-year, $96 million deal with the Denver Broncos, after considering signing with teams such as the Miami Dolphins, Arizona Cardinals, Seattle Seahawks, and Tennessee Titans. Manning spent his first 13 years with the Colts, leading them to their 2nd Super Bowl title in 2007 and after going 2-14 in 2011 and earning the No. 1 pick in the 2012 draft, Manning was released by the Colts 13 days earlier, and sat out that whole season due to undergoing neck surgeries. In a move that shocked both the media and fans, sophomore quarterback Tim Tebow would be traded to the New York Jets the next day, and just 2 months after he led the 4th seeded Broncos to a playoff win and go 7-4 as a starter. This signing is tied with the New Orleans Saints' signing of Drew Brees in 2006 as the greatest free agency signing in NFL history.
Aquatics at the 2012 Olympics in London, United Kingdom:
Swimming 28 July - 10 August. American swimmer Michael Phelps became the most decorated Olympic athlete of all time, by surpassing soviet gymnast Larisa Latynina. Phelps has won 22 Olympic medals (18 gold, 2 silver and 2 bronze) . The Swimming Medal Table was won by United States with 16 gold, 9 silver and 6 bronze. China was second with 5 gold, 2 silver, 3 bronze. France was third with 4 gold, 2 silver, 1 bronze.
Spain defeated Italy 4–0 in the final to successfully defend their 2008 Euro title. This is Spain's third Euro title win overall. It also made Spain the first men's team ever to win three consecutive major international competitions (Euro 2008, 2010 World Cup, Euro 2012).
Chelsea defeated Bayern Munich 4–3 on penalties, after a 1–1 draw after extra time. Chelsea will represent the UEFA region in the 2012 FIFA Club World Cup.
The Miami Marlins, known as the Florida Marlins until November 11, 2011, opened their new stadium, Marlins Park, on April 4 against the defending World Series champion St. Louis Cardinals.
October 27 : The Oklahoma City Thunder trade James Harden, Cole Aldrich, Daequan Cook, and Lazar Hayward to the Houston Rockets in exchange for Kevin Martin, Jeremy Lamb, two first round picks (which became Steven Adams in 2013 and Mitch McGary in 2014), and a second round pick that became Alex Abrines in 2013, a trade that was heavily criticised by fans and the media as many believe the Thunder would've won a title or possibly become the NBA's next dynasty had they kept the trio of Harden, Russell Westbrook, and Kevin Durant. Having played there until 2021, Harden had his best years in Houston, leading them to 7 straight playoff appearances, the Western Conference Finals in 2015 and 2018, won the 2017–18 MVP award, and in 2018-19, led the Rockets to 32 straight 30-plus point games.
Events
Barclays Center, a new arena in Brooklyn, opened late in 2012. The New Jersey Nets revealed in 2011 that they will become the Brooklyn Nets starting in the 2012–13 season, when they will begin playing in the new building.
Leinster crush Ulster 42–14 for their third Heineken Cup, becoming only the second club to successfully defend a Heineken Cup title and the first ever to win the Cup three times in four years.
South Africa, New Zealand and Wales. This was the first title for South Africa. It was also the first time in the competition's five-year history in which New Zealand did not claim the title.
New Zealand win the title with a clean sweep in the first season of the newly renamed competition, now including Argentina. Including the competition's previous history as the Tri Nations, this is the All Blacks' 11th series win.
London Welsh defeat Cornish Pirates 66–41 on aggregate to claim the title. London Welsh were initially denied a place in the Premiership due largely to stadium issues, but successfully appealed the denial, placing them in the Premiership for 2012–13 at the expense of bottom finisher Newcastle Falcons.
Rugby Pro D2 — Grenoble automatically promoted to Top 14 as champion. Mont-de-Marsan defeat Pau 29–20 in the playoff final to claim the second promotion place. These teams replace Brive and Lyon, which finished on the bottom of the Top 14 table.
Championship Final, October 26 at ECOLight Stadium, Pukekohe: Counties Manukau defeat Otago 41–16 to claim their first title at any level of provincial rugby in 32 years. The Steelers are promoted to the 2013 ITM Premiership, replacing bottom-placed Hawke's Bay.