Michael Phelps helped the United States' 4x100 meter freestyle swim team to a big lead, but his teammate and rival Ryan Lochte couldn't hold off France's Yannick Agnel on the final sprint and the American team settled for the silver medal.
Phelps - who lost out to Lochte in the 400 meter individual medley - raced second in the relay, and handed Colin Jones a lead of more than three-quarters of a second when he was done. The lead was .55 when Lochte dove in, but the 27-year-old faltered down the stretch.
In other swimming action, American Dana Vollmer broke the world record in the women's 100 meter butterfly, taking home gold with a time of 55.98. Brendan Hansen, also from the U.S., earned bronze in the men's 100 meter breastroke at 59.49, 1.03 seconds behind South African gold medalist Cameron Van der Burgh. Allison Schmitt was the silver medalist in the women's 400 meter freestyle, meaning that an American medaled in every swimming event of the day.
Outside of the pool, Honduras sent shock waves through the soccer world by defeating reigning world and European champion Spain, 1-0. The loss was Spain's second in two games, and means they won't advance to the quarterfinal of the Olympics. Host nation Great Britain recorded its first win, defeating United Arab Emirates 3-1 to move to the top of Group A, and Giovani dos Santos scored twice to give Mexico a 2-0 win against Gabon.
In fencing, Daryl Homer, who went to St. John's, unexpectedly advanced to the quarterfinal of the men's individual sabre event, knocking off heavily favored Aleksey Yakimenko in the round of 16 before falling to Romanian Rares Dumitrescu.
Rain wreaked havoc with opening-round tennis play at the All England Club, delaying Novak Djokovic's three-set win, and postponing Venus Williams' match until Tuesday. Great Britain's Andy Murray, playing with the roof closed, defeated Stanislas Wawrinka, 6-3, 6-3, under the roof.