China swept four golds on the first day of the Olympics and set a new world record in the women's 400 meter medley.

China's Yi Siling on Saturday became the first London gold medalist when she won the women's 10 meter air rifle, while Sun Yang became the first Chinese male swimmer to win an Olympic gold medal with an impressive swim in the 400 meter freestyle final that was only 0.07 seconds shy of the world record.

"I felt like a movie star," the 23-year-old Yi told reporters after winning the first gold at London Games. "Now I've got the gold medal I feel very happy and very excited. I almost cried." Yi, World No. 1 shooter, beat Poland's Sylwia Bogacka, by a 0.7 points margin. Yu Dan of China won the bronze medal.

Sun, 20, who defeated his South Korean rival Park Ta-Hwan on the final length of the 400 meter freestyle final, said: "The feeling is very nice, it's beautiful. It's a big dream come true for me."

"Because it's the Olympic Games, I felt a little bit nervous at the start, and then at the end, I felt that I could get a medal," Sun said.

Immediately following Sun's win, China's Ye Shiwen, 16, won the women's 400 meter medley, with a final lap of 28.93 seconds, which set a new world record breaking Stephanie Rice's record set at the Beijing Games four years ago. Ye's teammate Li Xuanxu came third in 4:32.91.

"I thought at the 200 meters that the race was lost, but then on realized the breaststroke I realized I was in the top two or three and I was confident I could win on the last leg," said Ye, according to a CNN report. "I dreamed of winning the gold medal, but I never ever expected to break a world record, I'm overwhelmed."

Weightlifting champion Wang Mingjuan, 26, won her maiden Olympic gold in 48 kg class adding to China's gold rush. Wang registered a best of 114kg to give her a combined total of 205kg.