Welsh swimmer David Davies will not have the chance to improve on the Olympic open water silver medal he won in Beijing at the 2012 Games in London.
The British Olympic Association has confirmed rival Daniel Fogg will compete for Team GB in the 10km event.
Davies and Fogg
had already been selected to compete at the Olympics in the pool in the 1500m but the open water is Davies's preferred event.
Davies accepted his 10k chances were
after his display in trials.
David Davies profile
3 March, 1985 in Barry
Olympic silver medallist - 10km (2008)
Olympic bronze medallist - 1500m freestyle (2004)
Commonwealth Games gold medal - 1500m freestyle (2006)
Commonwealth Games bronze medal - 400m freestyle (2006)
British 1500m record holder - 14:45.95
The 27-year-old, who is
expected to retire after the Olympics,
needed a top-10 finish or to beat Englishman Fogg at last week's FINA Olympic Marathon Swim qualifier.
But the Barry swimmer
finished 38th in Portugal and Fogg 35th,
meaning Fogg will compete at London 2012 in Hyde Park on 10 August.
"I am really happy to have been selected for my second event at the Games," said 24-year-old Fogg, who finished 16th in the open water at the 2011 World Championships.
"I'm back into hard training after recovering from the FINA Open Water event in Portugal and have been focusing on my first event, the 1500m.
"I'll now sit down with my coach to look at the strategy for the open water event too, which is a week after the pool swim. It's fantastic to get to race in both events."
won 1500m bronze on his Olympic debut
at Athens 2004 and
2006 Commonwealth gold
sixth in the pool at Beijing 2008.
Davies, who was close to winning
open water gold in 2008,
admitted that Fogg, England's 1500m Commonwealth Games bronze medallist in Delhi two years ago, deserved the nod.