SEOUL, South Korea (AP) _ Champion Lee Hyung-chul of South Korea knocked out Japan's Tomonori Tamura in the 12th round today to retain his World Boxing Association junior bantamweight title.

Lee, 25, landed a powerful right hook to Tamura's already-battered face that knocked him down with 28 seconds left in the 12th and final round.

It was Lee's first defense of the title he won last September. The victory improved his record to 23-19-4 with 14 knockouts. Tamura dropped to 26-23-3 with 18 knockouts.