The world's fastest man is marching on.
Jamaican sprinter Usain Bolt returned to competition at the 2012 London Games
Tuesday, fresh off his victory in Sunday's 100-meter finals. Bolt advanced to the semifinals of the men's 200 meter sprint, along with teammate Yohan Blake, the 100-meter silver medalist.
Americans Wallace Spearmon, Maurice Mitchell and Isaiah Young also advanced. The 200 meter final is set for Thursday night.
China's Liu Xiang is helped from the track by Britain's Andrew Turner, left, and Spain's Jackson Quinonez after falling in a men's 110-meter hurdles heat at the 2012 Summer Olympics, London, Aug. 7, 2012.
Tuesday also brought more disappointment for Chinese hurdler Liu Xiang. The 2004 gold medalist in the 110-meter hurdles hit the first hurdle in his opening round race, crashed to the track and had to be carried off. Back in 2008, at the Beijing Games, Liu was forced to withdraw due to a foot injury to the disappointment of his countrymen.
Chinese citizens reacted with disappointment.
"I feel very sad in my heart, but I think Liu Xiang was very courageous to have strived one more time," one fan said. "Indeed he failed in his performance and this is really regrettable and heartbreaking."
"Whether it's acceptable to us or not, it has happened," another Chinese fan said. "Although it is not what we expected, we still can understand. I think he was suffering too much pressure. I just hope he can recover soon. I know how tough it is to be an athlete."
Later Tuesday, Kenya's Asbel Kiprop goes for gold in the men's 1,500-meter final. Kiprop is the reigning Olympic champion but is expected to face a stiff challenge from Algeria's Taoufik Makhloufi.
In the women's competition, Australian Sally Pearson is the favorite in Tuesday's 100-meters hurdles gold against Americans Dawn Harper, the defending Olympic champion, and Lolo Jones.
Great Britain's Alistair Brownlee reacts as he crosses the finish line to win the gold medal in the men's triathlon at the 2012 Summer Olympics, Aug. 7, 2012, in London.
Meanwhile, host country Britain also added to its fast-growing medal tally Tuesday.
Alistair Brownlee won gold in the men's triathlon, pulling away from silver-medal winner Javier Gomez of Spain halfway through the last leg of the event, the 10-kilometer run.
Brownlee's teammate and younger brother, Jonathan Brownlee, claimed the bronze.
The Brits are also hoping for more gold on the cycling track as Chris Hoy races in the men's keirin (which features six racers being paced for for five laps, then sprinting for the last 2.5 laps), while Victoria Pendleton battles Germany's Kristina Vogel in the semi-finals in the women's individual sprint and a chance for a possible matchup against Australia's Anna Meares, who will face China's Guo Shauang in the semifinals.
China earned two more gold medals in gymnastics. Deng Linlin, a world champion on the balance beam in 2009, finished first on that apparatus. Earlier, China’s Feng Zhe captured the men’s parallel bars title.
China leads the overall medal count for the 2012 London Olympics with 65, including 32 gold. A close second is the United States with 63 medals including 29 gold. Britain is in third , with 43 including 19 gold.
Photo Gallery: Day 10 of Competition