After graduating from St. Mary’s High School in Berkeley, CA, in 2008, Marcus attended the University of California-Berkeley and earned Honorable Mention All-Pac-10 honors in 2010. In 2011, he helped lead Cal to the College World Series.
In 2017, Marcus batted .249 with 10 home runs and 40 RBI in 85 games in a season shortened by a stint on the disabled list from April 15 to July 5. He missed 74 games while on the DL after playing in all but 10 games over the previous two seasons. Marcus belted 27 home runs in 2016, the most by an A’s shortstop since Miguel Tejada had 27 in 2003. He became just the fifth shortstop in Athletics history with 20 home runs and his 42 homers over the 2015 and 2016 seasons were the most by a major-league shortstop during that span. In 2016, Marcus posted career highs in games (159), at-bats (568), runs (72), doubles (27), home runs (27), RBI (75), walks (51), strikeouts (139), slugging percentage (.435), OPS (.735) and extra base hits (56).
Marcus was the A’s recipient of the MLB Players Alumni Association’s Heart and Hustle Award in 2016, which honors active players who demonstrate a passion for the game of baseball and best embody the values, spirit and traditions of the game.