Japan's unbeaten Shinsuke Yamanaka scored four knockdowns on the way to his fifth straight stoppage win and the sixth defense of his WBC bantamweight title following Wednesday's ninth-round technical knockout victory over Stephane Jamoye of Belgium at Castle Hall in Osaka, Japan.

A 31-year-old who is THE RING's number two-rated 118-pounder, Yamanaka (21-0-2, 16 knockouts) dropped Jamoye (25-5, 15 KOs) once in the second round, twice in the eighth and for the last time in the ninth with a powerful body shot, causing referee Hector Afu to end the bout 11 seconds into the final round.

On the undercard, IBF junior featherweight titlist Kiko Martinez (31-4, 23 KOs) of Spain scored his fourth consecutive stoppage win, doing so by seventh-round technical knockout over ex-beltholder Hozumi Hasegawa (33-5, 15 KOs) of Japan.

The 28-year-old Martinez is THE RING's number three-rated 122-pounder and has not lost since falling by ninth-round knockout against Carl Frampton in February 2013.

Against Hasegawa, Martinez made the second defense of the title he won following a sixth-round stoppage that dethroned previously unbeaten Jhonatan Romero in August of last year.