It was at the end of extra time that the ball ended up with the 23-year-old.
Just over two seconds remained when Austin Reaves took the game's final shot against the Dallas Mavericks.
Then the score was 104-104, but the rookie netted and was celebrated as a hero after the Lakers' victory.
Reaves is undrafted and has a two-way contract with the big club.
This was the Lakers' third straight victory.