Mark Andrew Reynolds (born August 3, 1983) is an American former professional baseball infielder. He played in Major League Baseball (MLB) for the Arizona Diamondbacks, Baltimore Orioles, Cleveland Indians, New York Yankees, Milwaukee Brewers, St. Louis Cardinals, Washington Nationals, and two stints with the Colorado Rockies. A right-hander both when batting and throwing, Reynolds has gained attention for his frequent and long home runs, high strikeout totals, and defensive versatility, having been primarily a third baseman before transitioning to first base while playing for the Orioles.
The Diamondbacks drafted Reynolds in the 16th round of the 2004 MLB draft from the Cavaliers of the University of Virginia, with whom he played mainly shortstop. In the minor leagues, he played second base, third base, shortstop, and left field. He broke out in 2006 with Lancaster and Tennessee, batting .318 with 31 home runs (HR) and 98 runs batted in (RBIs) in 106 games. With the Diamondbacks in 2009, he established career highs in HRs (44), RBIs (102), stolen bases (24), and runs scored (98).
Known for his extreme statistical output, Reynolds displays prodigious power-hitting, record-breaking strikeout totals, and high error totals. Between 2009 and 2011, he finished with top ten home run totals and at bats per home run rates. In 2009, he set the all-time record for most strikeouts among batters in a season. He also holds two other of the ten-highest single-season strikeout totals (211 and 204), and led the league in strikeouts in four consecutive seasons. As of 2018, he led all active major league ballplayers in career strikeouts, with 1,870.
He is also known as Mark Andrew Reynolds.