Lucas Frost Giolito (born July 14, 1994) is an American professional baseball pitcher for the Chicago White Sox of Major League Baseball (MLB). He attended Harvard-Westlake School in Studio City, California, and was selected by the Washington Nationals in the 2012 MLB draft. He made his MLB debut with the Nationals in 2016. His fastball has been clocked as high as 100 miles per hour (160 km/h).

Giolito attended Harvard-Westlake School in Studio City, Los Angeles, California. In March 2012, his senior year, Giolito sprained the ulnar collateral ligament in his right elbow, sidelining him for the rest of his high school season. Giolito had a commitment to attend the University of California, Los Angeles (UCLA) and play for the UCLA Bruins baseball team.

Although some thought he was good enough to be selected with the first overall choice of the 2012 MLB draft, concerns about his elbow caused him to last to the 16th overall selection, where he was picked by the Washington Nationals.

Giolito signed with the Nationals on July 13, 2012—thirty seconds before the deadline—to a minor league contract with a $2.925 million signing bonus. By the end of the month, the team had scheduled Tommy John surgery to repair his injured elbow ligament.

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