It's an age-old adage that most Major Leaguers live by.
But not Matt Kemp.
The Dodgers' center fielder - who is listed at 6-foot-4 and almost played college basketball - straight up challenged new L.A. owner Magic Johnson on Conan last night, saying, "He can't beat me, I promise you that."
Magic has reportedly named himself a 15-7 favorite on the court, but Kemp thinks he'd have the advantage in a 15-13 nailbiter.
Matt Kemp vs. Magic Johnson - first to 15, win by two, call-your-own-fouls ... WHO YA GOT?