World Swimming Championships

Switzerland's Pamela Fischer and Anja Nyffeler perform in the synchronised swimming duet free final during the World Swimming Championships at the Sant Jordi arena in Barcelona...Switzerland's Pamela Fischer and Anja Nyffeler perform in the synchronised swimming duet free final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 25, 2013.  REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

Michael Dalder/Reuters

Switzerland’s Pamela Fischer and Anja Nyffeler perform in the synchronised swimming duet free final during the World Swimming Championships at the Sant Jordi arena in Barcelona, Spain.

France's Laura Auge and Margaux Chretien perform in the synchronised swimming duet free preliminaries during the World Swimming Championships at the Sant Jordi arena in Barcelona.

Michael Dalder/Reuters

France’s Laura Auge and Margaux Chretien perform in the synchronised swimming duet free preliminaries during the World Swimming Championships at the Sant Jordi arena in Barcelona

Combination photograph of China's Li Shixin performing a dive at the men's 1m springboard final at World Swimming Championships in Barcelona...A combination photograph shows China's Li Shixin performing a dive at the men's 1m springboard final during the World Swimming Championships at the Montjuic municipal pool in Barcelona July 22, 2013. Li finished first in the event and took the gold medal. REUTERS/Gustau Nacarino (SPAIN - Tags: SPORT DIVING)

Gustau Nacarino/Reuters

A combination photograph shows China’s Li Shixin performing a dive at the men’s 1m springboard final during the World Swimming Championships at the Montjuic municipal pool in Barcelona on Monday. Mr Li won the gold medal.