The first four medals are won at the Aquatics Centre. Can Michael Phelps pick up where he left off in Beijing, or will US compatriot Ryan Lochte take the first honours? Will British world silver medallist Hannah Miley win an Olympic medal in the women's 400m individual medley?
The first British and Irish boxers are in action too, including Britain's Luke Campbell, who won bantamweight silver in the 2011 world championships.
Swimming: 7.30 Men's 400m individual medley final 7.40 Women's 100m butterfly semi-final 7.51 Men's 400m freestyle final 8.09 Women's 400m individual medley final 8.28 Men's 100m breaststroke semi-final 8.48 Women's 4 x 100m freestyle relay final
Swimming commentators: Andy Jameson Adrian Moorhouse Sharron D
