As of the end of the 2012 season (per ESPN)
Matt Kemp - Dodgers
Mike Trout - Angels
Giancarlo Stanton - Marlins
Jordan Zimmermann - Nationals
Raul Ibanez - Yankees
Scott Rolen - Reds
Endy Chavez - Orioles
Wil Nieves - Diamondbacks
Lyle Overbay - Braves
Jhonny Peralta - Tigers
Jose Altuve - Astros
Brayan Pena - Royals
Carlos Gomez - Brewers
Chris Parmelee - Twins
Jeurys Familia - Mets
Placido Polanco - Phillies
Jeff Karstens - Pirates
John Jaso - Mariners
Cesar Ramos - Rays
Leonys Martin - Rangers
Brett Cecil - Blue Jays
Currently:
#27 Vladimir Guerrero (Los Angeles Angels of Anaheim)
#27 Geoff Blum (Houston Astros)
#27 Brett Cecil (Toronto Blue Jays)
#27 Brad Nelson (Milwaukee Brewers)
#27 Tyler Greene (St. Louis Cardinals)
#27 Sam Fuld (Chicago Cubs)
#27 Mark Reynolds (Arizona Diamondbacks)
#27 Matt Kemp (Los Angeles Dodgers)
#27 Anthony Reyes (Cleveland Indians)
#27 Matt Tuiasosopo (Seattle Mariners)
#27 Jeremy Hermida (Florida Marlins)
#27 Jordan Zimmerman (Washington Nationals)
#27 Mark Hendrickson (Baltimore Orioles)
#27 Walter Silva (San Diego Padres)
#27 Chris Coste (Philadelphia Phillies)
#27 Jeff Karstens (Pittsburgh Pirates)
#27 Gabe Kapler (Tampa Bay Rays)
#27 Garrett Atkins (Colorado Rockies)
#27 Matt Macri (Minnesota Twins)
Retired:
#27 Carlton Fisk (Boston Red Sox)
#27 Catfish Hunter (Oakland Athletics)
#27 Juan Marichal (San Francisco Giants)
Zaid Abdul-Aziz Houston Rockets (78)
Marvin Barnes Boston Celtics (79)
San Diego Clippers (80)
Mengke Bateer Denver Nuggets (02)
Ron Behagen Detroit Pistons (79)
Primoz Brezec Indiana Pacers (02, 03, 04)
Joe Caldwell St. Louis Hawks (66, 67, 68)
Atlanta Hawks (69, 70)
Carolina Cougars (71, 72, 73, 74)
Spirits of St. Louis (75)
Bill Dinwiddie Boston Celtics (71)
Nate Driggers Boston Celtics (97)
Tony Dumas Phoenix Suns (97)
Cleveland Cavaliers (98)
Duane Ferrell Indiana Pacers (95, 96, 97)
Danny Fortson Boston Celtics (00)
Gary Freeman Milwaukee Bucks (71)
Luther Green New York Nets (70)
Bill Hewitt Buffalo Braves (73)
John Johnson Portland Trail Blazers (74, 75, 76)
Houston Rockets (77, 78)
Seattle Supersonics (78, 79, 80, 81, 82)
Ollie Johnson Atlanta Hawks (78)
Chicago Bulls (79, 80)
Caldwell Jones Houston Rockets (83, 84)
Chicago Bulls (85)
Portland Trail Blazers (86, 87, 88, 89)
San Antonio Spurs (90)
Charles Jones Houston Rockets (95, 96, 97, 98)
Dwayne Jones Boston Celtics (06)
Cleveland Cavaliers (07, 08)
Charlotte Bobcats (09)
Johnny Jones Boston Celtics (68)
K.C. Jones* Boston Celtics (59)
Tony Koski New York Nets (69)
Leary Lentz New York Nets (69)
Malcolm Mackey Phoenix Suns (94)
Bob McIntyre New York Nets (70)
Rich Niemann Boston Celtics (70)
Mel Nowell New Jersey Americans (68)
Jimmy Oliver Boston Celtics (94)
Zaza Pachulia Orlando Magic (04)
Milwaukee Bucks (05)
Atlanta Hawks (06, 07, 08, 09)
Med Park St. Louis Hawks (56)
Johan Petro Seattle Supersonics (06, 07, 08)
Denver Nuggets (09)
Oklahoma City Thunder (09)
Chick Reiser Baltimore Bullets (48)
Kenny Sailors Denver Nuggets (50)
Bob Schafer St. Louis Hawks (56)
Steve Sheppard Detroit Pistons (79)
Mike Silliman Buffalo Braves (71)
Elmore Spencer Los Angeles Clippers (93, 94, 95)
Denver Nuggets (96)
Portland Trail Blazers (96)
Seattle Supersonics (97)
Art Spoelstra Minneapolis Lakers (58)
Kevin Stacom Boston Celtics (75, 76, 77, 78, 79)
Indiana Pacers (79)
John Tresvant St. Louis Hawks (66)
Jack Twyman* Cincinnati Royals (58, 59, 60, 65, 66)
Bob Verga New York Nets (69)
Jim Ware San Diego Rockets (68)
Major league baseball players
Tim Lincecum
Alex Rodriguez.
no
major league baseball is the hightest baseball league with the best players
Major League Baseball Players Alumni Association was created in 1982.
there are not a set number
There are 25 players on a major league roster
There are 30 Major League Baseball teams. Each has 25 players, so there are 750 players in the Major Leagues. From September 1 through the end of the regular season (usually the first Sunday in October) teams can expand their roster to 40 players, so during that period there can be 1,200 Major League Baseball players. Teams also have 10 players on their A, AA and AAA minor league affiliates
Currently Dustin Pedroia is number 15 for the Red Sox.
Yes
Charlie Gehringer Derek Jeter Leo Durocher