Michael Phelps won his sixth gold medal of the Beijing Olympics on Friday morning, defeating rivals Laszlo Cseh and teammate Ryan Lochte in the 200-meter individual medley. Phelps defended his title from four years ago in Athens, winning in 1 minute, 54.23 seconds and lowering his own world record of 1:54.80 set at last month's US trials. It was the American's sixth world mark in Beijing. Cseh took the silver in 1:56.52, the Hungarian's third runner-up finish to Phelps in Beijing. Lochte earned the bronze in 1:56.53, 29 minutes after he upset defending champion Aaron Peirsol to win the 200 backstroke. It was the 21st world record set during the swimming competition.