Marcus Andrew Semien (born September 17, 1990) is an American professional baseball shortstop for the Oakland Athletics of Major League Baseball. He previously played in the MLB for the Chicago White Sox.

Semien grew up pitching and playing infield in El Cerrito Youth Baseball, across the bay from San Francisco, and was a member of the area's All-Star teams. He went on to attend St. Mary's College High School in Berkeley, California. At St. Mary's, he hit .471 as a junior, .371 as a senior, and was named all-league three times where he was drafted by the Chicago White Sox in the 34th round of the 2008 MLB Draft. He chose not to sign and instead chose to attend college at the University of California, Berkeley. After struggling as a freshman, Semien improved as a sophomore, hitting .328. As a junior, Semien was the starting shortstop for the team, but hit .275, hurting his stock for the MLB Draft.

Semien was again drafted by the White Sox this time in the sixth round of the 2011 MLB Draft. He started his career in 2011 with the Class A Kannapolis Intimidators. He finished the 2011 season hitting .253 in 229 at-bats with, 15 2Bs, 2 3Bs, 3 HRs, 26 RBI and 3 SBs. Semien was moved up to Class A-Advanced Winston-Salem Dash for the 2012 season. There he hit .273 in 418 at-bats with 31 2Bs, 5 3Bs, 14 HRs, 59 RBI and 11 SBs. For the 2013 season, Semien was ranked the White Sox #8 prospect.

...
Wikipedia