William "Rookie" Theron Davis (born April 29, 1993) is an American former professional baseball pitcher.

He has played in Major League Baseball (MLB) for the Cincinnati Reds and Pittsburgh Pirates.

Davis attended Dixon High School in Holly Ridge, North Carolina.

[8] On December 28, 2015, Davis was traded to the Reds with Caleb Cotham, Tony Renda, and Eric Jagielo in exchange for Aroldis Chapman.

[20] On February 18, 2019, Davis signed a minor league deal with the Pittsburgh Pirates and was invited to spring training.

[25][26] On September 1, Davis was outrighted off the Pirates roster and he elected free agency following the season.