OSAKA (Kyodo) -- Japan's Ryosuke Nishida knocked out Thailand's Anuchai Donsua in the seventh round Sunday to win the first defense of his IBF bantamweight world title.

The 28-year-old Nishida, who claimed the bantamweight belt in May, exploited his reach to keep an effective distance from his opponent from the start and got into a good rhythm at Sumiyoshi Sports Center in Osaka.

He knocked Anuchai, the IBF's 14th-ranked contender, down with a counter punch in the fifth inning and finished him off with a body blow in the seventh. Nishida remains unbeaten in 10 fights with two knockouts, while Anuchai suffered his first loss in 17 pro bouts.