TOKYO (AP) _ South Korea's Cho In-joo knocked down Japan's Keiji Yamaguchi twice in the 12th and final round Sunday and retained his WBC super flyweight title with a unanimous decision.

Cho was making his third defense of the title he wrested from Gerry Penalosa of the Philippines on Aug. 29, 1998.

Victor Cervantes of Mexico scored it 114-110 for Cho. The two U.S. judges also favored the South Korean _ Henry Elespuru had it 117-107 and Barbara Perez scored it 117-108.

Before a crowd of 8,000 at Ryogoku Kokugikan Sumo Arena, Cho landed sharp, accurate punches in dominating the final round.

Yamaguchi, ranked No. 9, often was forced into the corner in the early rounds. Cho said he had to rely more on his right hand.

``I felt I could win in the sixth round because I knew my left blows were effective,'' Cho said.

Cho improved his record to 16-0, including seven knockouts. Yamaguchi is 28-5, with 11 KOs.

Both fighters weighed 112 pounds.