He played in Major League Baseball (MLB) from 2004 to 2010 and again from 2012 to 2013 for the Arizona Diamondbacks, Chicago Cubs, Florida Marlins, and Washington Nationals.

In four minor league seasons, Tracy hit .335 with 24 home runs, 85 doubles, and 206 RBIs in 337 games.

He finished his rookie season with a .285 average, eight home runs, 53 RBIs, and a .343 on-base percentage in 143 games.

He also tied Edwin Encarnación for the major league lead in errors by a third baseman, with 25,[5] as he again had a .935 fielding percentage at third base.

[7] Manager Bob Melvin said Whitesell would get a chance to play every day,[8][9] and that Tracy "is going to pinch hit, (and) he's going to fill in at third and first for a while.

"[9] That did not last long, however, as on May 19, not even two weeks later, Melvin had been fired as manager and the team optioned Whitesell back to Reno.

[11] Tony Clark was released in mid-July, and Whitesell was called back up for the third time in the season to replace him on July 16.

Hinch spoke with Tracy, who was batting a career-low .222 with a .288 on-base percentage at the time, and Whitesell on July 17.

On January 26, 2010, Tracy signed a minor league contract with the Chicago Cubs with an invite to spring training.

[20] Chad Tracy signed a minor league deal with the Washington Nationals in the spring of 2012.

He showed enough improvement at the plate during spring training to make the club's opening day roster.