Bakhodir Jalolov’s perfect record remains intact.

The huge heavyweight from Uzbekistan dropped American veteran Curtis Harper once apiece in the third and fourth rounds Saturday night. Referee Thomas Taylor stopped their scheduled 10-round fight at 1:53 of the fourth round, as soon as Harper reached his feet following the second knockdown at Dignity Health Sports Park in Carson, California.

The 6-foot-7, 247½-pound Jalolov, a southpaw who won an Olympic gold medal in 2021, improved to 12-0 and produced his 12th knockout on the Jose Zepeda-Regis Prograis undercard. Harper (14-9, 9 KOs), of Jacksonville, Florida, lost by knockout for the fourth time in his career.

After dropping Harper late in the third round, Jalolov opened up on Harper in the opening minute of the fourth round. Harper tried to defend himself, but Jalolov’s straight left continually connected.

A left by Jalolov sent Harper to one knee. He got up as Taylor’s count reached nine, but Taylor still stopped the fight.

Harper objected, but Jalolov clearly was on his way to a knockout victory.

A flush left by Jalolov knocked Harper flat on his back with 17 seconds to go in the third round. Harper got to one knee and answered Taylor’s count at five.

The bell sounded before Jalolov got a chance to hit Harper again.

Jalolov drilled Harper with a left hand that forced Harper to hold him with just under 45 seconds remaining in the second round.

Jalolov drilled Harper with a left hand that made Harper reset his feet with just under 50 seconds to go in the second round. A few seconds later, Harper intentionally tried to head-butt Jalolov in a clinch.

Taylor immediately called for a break, admonished Harper and deducted a point from him.

After taking a passive approach to the first round, Harper unloaded back-to-back right hands, the second of which missed wildly, barely 10 seconds into the second round.

An overhand left by Jalolov backed Harper into the ropes with 25 seconds to go in the first round. A straight left by Jalolov stopped Harper from coming forward a few seconds before the midway mark of the opening round.

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