Cyprus' Pavlos Kontides overtook world champion Tom Slingsby in the Laser class sailing competition Wednesday at the London Games.
Kontides had two top-four finishes Wednesday to bump the Australian Slingsby to second after six of 10 preliminary races.
The Netherlands' Dorian van Rijsselberge still leads in men's RS:X (windsurfer) after four races. He won one race Wednesday and took third in the other.
In women's RS:X, Spain's Marina Alabau Neira won twice to establish herself as the favorite. She's won three of the four races so far.
Australians Nathan Outteridge and Iain Jensen solidified their lead in the men's 49er (skiff), thanks to a win and a runner-up finish.
Following victories in the first four races in Laser Radial (women's one- person dinghy), Ireland's Annalise Murphy had her first bad day. She took eighth and 19th, but is still effectively in first because of the discarded score.
Australia is still leading in the women's Elliott 6m -- a new match racing sailing event comprised of 12 crews. It won twice again Wednesday to improve to 8-0 in the round robin stage, after which the best eight boats move on to the knockout stage.
The U.S. split its two matches and sits in good position to advance.