Carl Michael Yastrzemski Sr. ( yə-STREM-skee; born August 22, 1939), nicknamed "Yaz", is an American former professional baseball player who played his entire 23-year career with the Boston Red Sox of Major League Baseball (MLB). He started his career primarily as a left fielder, but also played 33 games as a third baseman. Later in his career, he was mainly a first baseman and designated hitter.
Yastrzemski is an 18-time All-Star, the possessor of seven Gold Gloves, a member of the 3,000 hit club, and the first American League player in that club to also accumulate over 400 home runs. He is second on the all-time list for games played, and third for total at-bats.