ATLANTA -- Ronald Acuna Jr. of the Atlanta Braves has become only the third player in baseball history to hit 40 homers in a season while 21 years old or younger.

The other two were Eddie Mathews and Mel Ott, who are both in the Hall of Fame.

Acuna, 21, launched a two-run shot Thursday in the third inning, a towering 432-foot drive into the second level at SunTrust Park off Philadelphia's Aaron Nola.

With eight games left in the regular season, Acuna also has a shot at becoming just the fifth player in baseball history to hit 40 homers and steal 40 bases in a season. He has 37 stolen bases.

Mathews hit 47 homers as a 21-year-old for the Milwaukee Braves in 1953. Ott was 20 when he hit 42 homers for the New York Giants in 1929.