Mark Allan Hendrickson (born June 23, 1974, in Mount Vernon, Washington) is an American former National Basketball Association power forward and current Major League Baseball pitcher who currently plays for the Baltimore Orioles. He is one of just 12 athletes to play in both MLB and the NBA.
Hendrickson is notable for his size, at 6' 9". The only players in Major League Baseball as of 2010 who are taller than Hendrickson are Jon Rauch, at 6'11", and Chris Young, at 6'10". Hendrickson is a groundball pitcher, with a fastball in the high 80s and a decent 12–6 curveball. Hendrickson also has a 10–4 slider, but his slider only reaches the high 70s to low 80s. Thus, when Hendrickson has success, it is due to control, movement, and location and not power.
Hendrickson was a three-sport standout in tennis, basketball, and baseball at Mount Vernon High School in the state of Washington. During his sophomore year, he was a member of the state championship baseball team and the runner-up state basketball team. He was a member of the state championship basketball team during his junior year, where he earned recognition as the co-MVP of the tournament for his play. He was also named team captain, team MVP, and named to the All-Area and All-State teams. A tennis state qualifier, Hendrickson was also named to the baseball All-Area team.