SAN FRANCISCO – Andy Cruz wouldn’t settle for anything other than an impressive stoppage in his second professional fight Saturday night.

Almost five months after Juan Carlos Burgos took him the 10-round distance in his pro debut, the elite lightweight prospect pummeled late replacement Jovanni Straffon on the Regis Prograis-Devin Haney undercard at Chase Center. Cuba’s Cruz (2-0, 1 KO) blasted Straffon with various vicious head shots before referee Edward Collantes finally halted his brutal assault early in the third round.

Cruz won a gold medal at the delayed 2020 Summer Olympics two years ago in Tokyo. The 28-year-old Cruz convincingly outboxed Burgos (35-8-3, 21 KOs), another Mexican veteran, in his 10-round debut July 15 at Masonic Temple in Detroit.

Burgos has not been knocked out in 46 professional fights. Straffon (26-6-1, 19 KOs) lost by technical knockout for the second time in his 13-year, 33-fight pro career.

Mexico City’s Straffon, a former IBO lightweight champ, replaced an injured Hector Tanajara (21-1-1, 6 KOs) as Cruz’s opponent on less than three weeks’ notice.

The round before the stoppage, a right-left combination by Cruz buzzed Straffon less than a minute into the second round. Cruz continued to tee off on Straffon, including a vicious right uppercut that knocked Straffon off balance.

A right hand by Cruz made Straffon stumble backward about 20 seconds into the second round. Collantes could’ve stopped the bout during that one-sided second round, but he allowed Straffon to continue.

Cruz’s hand speed enabled him to land a crisp combination that backed Straffon into the ropes and got his attention with over a minute remaining in the first round.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.