Finished scoring touchdowns, Frank Gore scored his first professional knockdown. Or, rather, knockout.

Gore won his professional boxing debut Saturday by landing a right cross that knocked out Yaya Olorunsola, who fell to the canvas in the fourth round of the co-main event of Gamebred Boxing 1 in Mississippi. 

Saturday also marked Gore’s 39^th birthday, so he had another reason to bask in victory. Olorunsola, 29, is 0-2 in his career.

Gore previously boxed former NBA All-Star Deron Williams in an exhibition bout in December. After earning more than $62 million during a 16-year NFL career, he reportedly was paid $300,000 to fight Williams.

As he turns to his future, Gore leaves behind an NFL past that includes 16,000 career rushing yards. Only Emmitt Smith and Walter Payton ran for more.