Russia's Ilya Zakharov led the men's 3- meter springboard after the preliminary round Monday and reigning Olympic champion He Chong of China was second.
American Troy Dumais, already a medalist here in his fourth Olympics, is third going into the last two rounds Tuesday.
Zakharov, who won silver with Evgeny Kuznetsov in the synchronized event last week, had 507.65 points on six dives.
He was 6.75 points back and Dumais 21.05. American Chris Cowgill and Canadian Alexandre Despatie, a silver medalist in the event the last two Olympics, were also among the 18 divers who qualified for the semifinals.
China has won all five diving events so far at the London Games after going 7- for-8 in Beijing four years ago.