Mark Alan Williamson (born July 21, 1959) is a retired professional baseball player who played pitcher in the Major Leagues from 1987 to 1994. He played for the Baltimore Orioles. On April 29, 1988, Williamson pitched 6 shutout innings to help the Orioles defeat the White Sox 9-0. The victory snapped the Orioles 21 game losing streak that started the 1988 season. On July 13, 1991, he pitched a no hitter along with Bob Milacki, Mike Flanagan, and

Gregg Olson Greggory William Olson (born October 11, 1966) is an American former professional baseball player, coach, scout and television sports commentator. He played in Major League Baseball as a right-handed pitcher from through , most prominently a ...

against the

Oakland Athletics The Oakland Athletics (often referred to as the A's) are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. The te ...

. As of 2018, Mark is a real estate broker in the San Diego, CA suburbs.

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: 1959 births Living people Major League Baseball pitchers Baseball players from Texas Baltimore Orioles players Hagerstown Suns players Sportspeople from Corpus Christi, Texas Beaumont Golden Gators players Las Vegas Stars (baseball) players Reno Padres players Rochester Red Wings players {{US-baseball-pitcher-1950s-stub