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Johnathan Mackensey Williamson (born July 15, 1990) is an American former professional baseball outfielder. He played in the Major League Baseball (MLB) for the San Francisco Giants and Seattle Mariners, and in the KBO League for the Samsung Lions. Williamson played college baseball at Wake Forest University.
In 2013, the Giants assigned Williamson to the San Jose Giants of the Class A-Advanced California League. He hit 25 for San Jose.
In 2014, he was invited to his first spring training. 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. After beginning the season with a .318 batting average and three home runs, Williamson went on the disabled list with a torn ulnar collateral ligament of the elbow and had Tommy John surgery, ending his 2014 season. Williamson would go on to fully recover from the surgery without complication.
In 2015, he began the season with Richmond and the Giants promoted him to the Sacramento River Cats of the Class AAA Pacific Coast League in June. The Giants promoted Williamson to MLB on September 16, 2015. He made his MLB debut with the Giants on September 23. He made his first MLB start in right field on September 25, 2015, and got his first MLB hit off Sonny Gray of the Oakland Athletics.
In 2016, Williamson began the season with Sacramento, and received a promotion to the major leagues on April 15, but was sent back to the minors a week later. On June 2, Williamson was called up after Hunter Pence suffered an injury. 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.
During 2017 spring training, Williamson was in competition for the left field job, competing against other outfielders. He suffered a minor injury towards the end of spring training, which would cause him to miss opening day. Williamson was ping-ponged back and forth between the MLB and triple-A throughout the 2017 season and began to make large contributions to the team near the season's end, including a 3 for 3 performance with a monstrous home run against Clayton Kershaw on September 24, 2017. On March 28, 2019, Williamson was designated for assignment, after failing to make the Opening Day roster. On April 4, 2019, Williamson cleared waivers and was outrighted to Triple-A. On June 1, 2019, Williamson elected to become a free agent after clearing waivers a second time in 2019.
In November 2020, Williamson filed a personal injury lawsuit against China Basin Ballpark Company LLC, which owns and operates Oracle Park, after tripping on the ballpark's on-field warm-up mound, hitting his head against a wall and suffering a concussion while trying to catch a fly ball hit in April 2018, which was hit by Bryce Harper. Williamson claimed that he was still suffering from symptoms including nausea and dizziness which effectively ended his career. The on-field mounds were removed the following season.
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