It's time for Britain's first qualifying athlete to take to the water as Keri-Anne Payne competes in the 10km swimming event in Hyde Park as favourite while Usain Bolt defends his 200m crown.
Team GB poster-girl Keri-Anne Payne was the first host nation athlete to qualify for the Olympics and her long journey will come to a conclusion today in the Serpentine boating lake at Hyde Park. Payne won silver in the women's 10km swim in Beijing and will start the race in London as favourite for gold after victory in last year's world championships. In the Olympic Stadium, Usain Bolt will have to beat the in-form Yohan Blake, his Jamaican countryman, if he wants to defend his 200m crown from Beijing, while the flamboyant Phillips Idowu – injury permitting – will leap for the podium in the men's triple jump despite a season blighted by poor form and injury. There are high hopes for GB's Nicola Adams in the women's flyweight boxing at the ExCeL Centre – while in the lightweight division Ireland have their only gold medal prospect in Katie Taylor. GB's Laura Bechtolshiemer is a medal hope in the equestrian individual dressage at Greenwich Park and there's the small matter of the women's football final at Wembley Stadium.
Gold medals up for grabs: 23
Today's medal sports: athletics, canoe sprint, swimming, equestrian, sailing, boxing, wrestling, diving, football, beach volleyball, taekwondo, water polo
Actor Simon Callow is tonight's master of ceremonies for Prom 36 in which Sir Mark Elder conducts the Halle Orchestra at the Royal Albert Hall in a performance in honour of Ivor Novello, the silent-movie actor, West End playwright and composer who dominated London's stage musicals in the 1930s and 1940s. Get Over It Productions, stalwarts of the Camden Fringe festival for many years, perform a modern play called Deathline, a dark comedy about second chances, the afterlife and fallen angels at the Etcetera Theatre (starts tonight and continues until Saturday 11th August). Mark Almond's performance at the Royal Festival Hall, is one of the hotly anticipated highlights of the Meltdown festival, and includes a rare live performance of Marc and The Mambas' groundbreaking 1983 release 'Torment and Toreros'. Joining the line-up is very special guest musician and Marc Almond collaborator, Jim Thirwell. The Noisettes, The Overtones and The Enemy are all at appearing at BT London Live at Hyde Park today. Pink Floyd bassist Guy Pratt is just one of the guests at this week's Thursday Night Live at the Serpentine Gallery Pavilion. And Jeremy Deller's Sacrilege installation (a bouncy castle in the shape of Stonehenge) is at Crystal Palace Park - along with the dinosaurs - what fun!
Last chance: Oliver Award winner Martyn Jacques' first ever solo show, which sets the silent film The Cabinet of Dr Caligari to a new live score, performs his last show at the Soho Theatre in the new Soho Downstairs space.