American Rebecca Giddens won the silver medal in the single kayak, finishing well behind Elena Kaliska of Slovakia. Helen Reeves of Britain took the bronze.

Giddens was fourth going into the final, then turned in a run of 107.06 seconds to take the overall lead at 214.62. But Kaliska, racing last, easily beat her with a 106.29 that gave her a two-race total of 210.03.

In the men's single canoe, Tony Estanguet of France won after a post-race review gave Michal Martikan of Slovakia a two-second penalty, making his time 189.28 seconds. Estanguet finished in 189.16, giving him his second consecutive gold medal in the event.

Martikan, the final competitor, appeared to finish first when he crossed the line in a time of 187.28. Martikan raised his arms and paddle in the air and was announced the winner.

Several minutes later, International Canoe Federation official Andre Luiz Behs said a penalty had been recorded by a race official, but had not been properly transferred. "There was a clear penalty," Behs said. It was "not transmitted through the electronic system."

The review continued for several more minutes before the gold was awarded to Estanguet. Martikan had to settle for his second straight silver, and Stefan Pfannmoeller of Germany took the bronze in 191.56.

U.S. kayaker Rebecca Giddens negotiates her way to the silver medal.