Nonito Donaire stopped Toshiaki Nishioka at 1:54 of the ninth round Saturday night, retaining his WBO 122-pound title with a dominant performance in his 29th straight victory.
San Leandro's Donaire (30-1, 19 knockouts) patiently waited for openings against Nishioka (39-5-3) before knocking down the Japanese veteran in the sixth round.
Donaire then put Nishioka down again with a vicious right hand in the ninth, and referee Raul Caiz stopped it after Donaire landed an uppercut moments later.
Brandon Rios stopped Mike Alvarado in the seventh round of a 140-pound bout in the co-main event at a sold-out Home Depot Center in Carson.
Cal (17-2) beat Cal Poly 31-14 to win the Stanford Invitational Sevens title at Steuber Rugby Stadium. The Bears also defeated the Mustangs, UC Davis and Sacramento State in pool play before blanking Saint Mary's 26-0 in the semifinals. Captain Seamus Kelly scored five tries on the day, including twice in the final.
The Bears held their opponents to only 35 points over five games. The next-closest total was 64 surrendered by the Gaels, who finished 3-2, including a 38-5 win over UCLA for third place. Stanford went 1-4, falling to Santa Rosa College 26-24 in the seventh-place match.
Catherine Breed (Amador Valley High) was on the victorious 200-yard freestyle and 400 medley relay teams. Taylor Nanfria (San Ramon Valley High) won the 1,600 free in a meet-record 17 minutes, 19.60 seconds. Rachael Acker (Gunn High-Palo Alto) set meet and pool marks in the 100 free at 51.18 seconds.
The Warriors waived former Missouri guard Stefhon Hannah, who was signed as a free agent Oct. 1. The team now has 19 players under contract.
Wire services contributed to this report.