Answer: Wilson Betemit
Wilson Betemit began his MLB career with the Atlanta Braves in 2001. He only appeared in 8 games and did not make a MLB appearance again until 2004 at the age of 22.
Betemit played four seasons in Atlanta, hitting .281 with 13 home runs and 52 runs batted in. In his four years with the Braves, he only played in 233 games, so in the small sample size, those are actually pretty solid numbers.