He played for the school's baseball team as a pitcher, and was rated the best pitching prospect in the state of North Carolina.

[2] The Boston Red Sox chose Williamson in the 46th round of the 2011 MLB Draft, but he decided to return to Wake Forest for his senior year.

[3] He signed with the Giants, beginning his professional career in the Rookie-level Arizona League, hitting two home runs in 19 plate appearances.

The Giants then promoted Williamson to the Salem-Keizer Volcanoes of the Class A-Short Season Northwest League, where he hit seven home runs in 125 plate appearances.

[5] Though the Giants wanted to assign Williamson to the Richmond Flying Squirrels of the Class AA Eastern League to start the 2014 season, an elbow injury led them to keep him in San Jose, where he could still play as a designated hitter.

In 2015, he began the season with Richmond[7] and the Giants promoted him to the Sacramento River Cats of the Class AAA Pacific Coast League in June.

[10] In 2016, Williamson began the season with Sacramento,[11] and received a promotion to the major leagues on April 15,[12] but was sent back to the minors a week later.

[13] On June 8, 2016, Williamson hit his first major league home run off David Price of the Boston Red Sox, a tie-breaking shot in the bottom of the eighth inning.

Williamson claimed that he was still suffering from symptoms including nausea and dizziness which effectively ended his career.