He played in Major League Baseball (MLB) for the Texas Rangers, Toronto Blue Jays, Milwaukee Brewers, Arizona Diamondbacks, and Chicago Cubs.

He was drafted by the Los Angeles Dodgers following his senior year in high school, but did not sign.

[1] Davis attended Diablo Valley College after high school and played baseball.

He later attended the City College of San Francisco, where he earned Second Team All-Conference honors as a pitcher in his junior season.

Davis' 2002 season was cut short due to injury, managing to make just 10 starts for the Rangers.

On Mother's Day, May 14, 2006, Davis was one of more than 50 batters who brandished a pink bat to benefit the Breast Cancer Foundation.

Davis made a brief appearance in 2005 as a potential home buyer on the A&E television program Flip This House episode "It's a Rat Race".

[7] Davis' 2008 season was cut short due to injury, making 26 starts, and finishing with a record of 6–8.

On August 12, 2009, Davis' former team, the Milwaukee Brewers, put a waiver claim on him, but he was not traded.

On April 12, 2011, Davis signed a minor league contract with the Chicago Cubs, stipulating that if he were to join the Cubs major league team that season, he would make $900,000 with possible bonuses that could bring his total salary to nearly $2 million.

[13] On July 18, 2011, Davis signed a minor league contract with the Chicago White Sox.

Davis threw four pitches: a four-seam fastball at 84–87 mph, a cutter at 80–84, a curveball at 68–72, and a changeup at 78–81.

Davis made two starts in the regular 2008 season before having surgery to remove his thyroid, a procedure scheduled for April 10.