Beijing, China (My Sportsbook) - Zou Shiming won China's first-ever Olympic gold medal in boxing on Sunday, beating Mongolia's Serdamba Purevdorj in the final of the light-flyweight class Sunday.

Zou hit Purevdorj with a combination of punches in the first round, earning one point. The fight was then stopped in the second round because Purevdorj had a shoulder injury.

It was Zou's second Olympic medal, as he won bronze in Athens four years ago.

"After a very good preparation I wanted to deliver to the spectators a wonderful show, but I did not expect that my opponent would get injured," said Zou. "However, the gold medal is the most important thing."

In fact, Zou's performance was the 50th gold medal for the host country at these Games. It is the seventh time that one nation has won at least 50 gold medals at one Olympics. The U.S. set the all-time record at Los Angeles with 83 gold medals.

Later it was Zhang Xiaoping's turn and he won China's second gold in boxing with an 11-7 decision over Ireland's Kenny Egan in the light heavyweight category.

Mongolia's Badar-Uugan Enkhbat won the gold medal in the bantamweight class by defeating Yankiel Leon Alarcon of Cuba, 16-5.

Alexey Tishchenko of Russia won the gold medal in the lightweight division, beating France's Daouda Sow on points, 11-9. Tishchenko, who won the featherweight gold medal in 2004, became the fourth boxer to win an Olympic gold in two different weight divisions.

The shock of the tournament though came from one nation, Cuba, which failed to win a boxing gold medal for the first time since 1968.

Carlos Banteaux Suarez was Cuba's last chance at gold, but he lost 18-9 on points to Kazakhstan's Bakhyt Sarsekbayev in the welterweight division.

Despite the lost chance at a title, Cuba won four silver and four bronze medals at these Games.

Italian Roberto Cammarelle added Olympic gold to his world super heavyweight title with a fourth-round stoppage of China's Zhang Zhilei. Cammarelle was easily ahead on points when the bout was stopped because of a blow to Zhang's head.