Former San Francisco 49ers star Frank Gore made his pro boxing debut on Saturday, and he made sure it's one he'll remember forever.

Gore starred in the co-main event of the Gamebred Boxing bout, facing off against Yaya Olorunsola. The 39-year-old former running back, who was celebrating his birthday, made it quite the treat for the viewers as he sent his opponent to the canvas face-first in the fourth round.

After landing a combination punch, Gore followed it up with a big right hand to violently put Olorunsola to sleep.

Here's a look at the brutal knockout:

Following the huge victory, Frank Gore took to Twitter to thank his team for making it possible for him to record such win. It was definitely one of the best birthday gifts for the ex-NFL star as he starts his pro boxing journey.

Frank Gore already made his boxing debut during the Jake Paul vs. Tyron Woodley 2 battle. He faced off against ex-NBA star Deron Williams, but it was only an exhibition bout.

The retired 49ers RB also lost the fight via decision, so him getting a knockout victory in his second fight and first professional one got to feel good.

Gore is a five-time Pro Bowler in his career. While he spent his glory days with the 49ers, he also played for the Indianapolis Colts, Miami Dolphins, Buffalo Bills and New York Jets.