Red Sox have a pretty good requirement for retiring numbers
Not counting Jackie Robinson the Sox have retired 5 numbers.
The Red Sox policy on retiring uniform numbers is based on the following criteria:
• Election to the National Baseball Hall of Fame
• At least 10 years played with the Red Sox
1: Bobby Doerr
• Played 14 seasons in Majors, all with Red Sox (1937-44, 1946-51), before retiring due to a back injury.
• Elected to Baseball Hall of Fame in 1986.
• Tied for AL lead with Dom DiMaggio in triples in 1950 (11).
• Led AL in slugging percentage in 1944 (.528).
• Named The Sporting News AL Player of the Year in 1944.
• Hit .409 (9-22) in 1946 World Series to lead Red Sox.
4 : Joe Cronin
• First modern-day player to become a league president.
• Elected to Baseball Hall of Fame in 1956.
• Compiled .301 average in 20 MLB seasons.
• Affiliated with Red Sox for 24 seasons as player/manager, manager, and general manager.
• Leads all Red Sox managers with 1071 wins.
• Managed Red Sox to AL pennant in 1946.
• Holds AL record for pinch-hit homers in a season, 5 (1943).
• Became 1st player to hit pinch-hit homes in both games of a doubleheader, June 17, 1943 (in a stretch when he hit three three-run pinch-hit homers in four at-bats).
• Participated in 12 All-Star Games for AL, six as a player
8 Carl Yastrzemski
• Named to the Baseball Hall of Fame in 1989.
• Along with Johnny Bench became the 18th and 19th players elected to Hall of Fame on the first ballot.
• Received 95 percent of Hall of Fame voting, the seventh highest in the history of voting at that time.
• First Little League player to be elected to the Hall of Fame.
• Won AL Triple Crown in 1967.
• Most games lifetime in the AL with 3,308.
• AL MVP in 1967.
• Seven-time Gold Glove winner.
• Tied MLB record with 1.000 fielding percentage in 1977.
• Selected Outstanding Player of 1970 All-Star Game.
• Played 167 consecutive errorless games.
• Only AL player with 400 home runs and 3,000 hits
9 Ted Williams
• Named to starting outfield of Greatest Living Team, 1969.
• Named MLB Player of Decade for 1950s.
• Elected to Baseball Hall of Fame in 1966.
• AL MVP in 1946, 49.
• Won AL Triple Crown in 1942, 47.
• Led AL in batting six times.
• Led AL in home runs four times.
• Led AL in total bases five times.
• Led AL in walks eight times.
• Led AL in slugging percentage nine times.
• Holds MLB record for most successive times reaching base safely, 16, in Sept. 1957 (2 singles, 4 HR, 9 BB, 1 HBP).
• Oldest MLB player to win batting title, batting .388 in 1957 at age 39. Won batting title again in 1958 at age 40.
• Voted Greatest Red Sox Player of all time by fans, 1969 and 1982.
• Holds MLB rookie records for most walks (107) and RBIs (145).
• Holds Red Sox record with 17 grand slams
27 Carlton Fisk
• Carlton Fisk will always be remembered as the player who hit the historic, 12th-inning, game-winning homer in Fenway Park off Reds pitcher Pat Darcy in Game 6 of the 1975 World Series. Besides being the hero on MLB's biggest stage in a game that has been referred to as "the greatest World Series game ever played," Fisk had many other memorable highlights during his 11-year career as a member of the Red Sox.
• Red Sox first draft choice and fourth overall selection in the January 1967 Winter Baseball Amateur Draft.
• Made his MLB debut on September 18, 1969.
• Was the first unanimous winner of the American League Rookie of the Year Award in 1972 (.293, 22 HR, 61 RBIs). He was also tied for the AL lead with nine triples.
• Won the 1972 AL Gold Glove Award for defensive excellence.
•Seven-time All-Star, including four games started. He was voted as a starter five times but was replaced in 1974 due to a knee injury.
•Was the AL Honorary All-Star Game captain on July 13, 1999 at Fenway Park.
•Is the all-time Red Sox leader in games caught with 990.
•Red Sox Hall of Fame Inductee on September 8, 1997