I used WAR to determine these players, using both for single season and career.
AL
AL EAST
NEW YORK YANKEES
SP Whitey Ford
1B Lou Gehrig
SS Derek Jeter
RF Babe Ruth
DH Jason Giambi
BOSTON RED SOX
1B Jimmie Foxx
3B Wade Boggs
LF Ted Williams
CF Tris Speaker
RF Mookie Betts
DH David Ortiz
BALTIMORE ORIOLES
SP Jim Palmer
CP Zack Britton
1B Eddie Murray
2B Bobby Grich
LF Ken Williams (SLB)/B.J. Surhoff (if only BAL)
CF Paul Blair
DH Aubrey Huff
TAMPA BAY RAYS
SP David Price
1B Carlos Pena
2B Ben Zobrist
RF Ben Zobrist
DH Jose Canseco
TORONTO BLUE JAYS
CP Tom Henke
LF George Bell
CF Devon White
DH Paul Molitor
AL CENTRAL
MINNESOTA TWINS
SP Walter Johnson (WSH)/Bert Blyleven (if only MIN)
CP Joe Nathan
1B Rod Carew
2B Rod Carew
SS Joe Cronin (WSH)/Roy Smalley (if only MIN)
3B Corey Koskie
LF Shane Mack
RF Tony Oliva
DH Paul Molitor
DETROIT TIGERS
LF Bobby Veach
CF Ty Cobb
RF Al Kaline
CHICAGO WHITE SOX
SP Ed Walsh
1B Frank Thomas
2B Nellie Fox
SS Luke Appling
CF Chet Lemon
DH Frank Thomas
CLEVELAND INDIANS
SP Bob Feller
CP Cody Allen
1B Jim Thome
2B Nap Lajoie
SS Lou Boudreau
3B Al Rosen
LF Albert Belle
CF Tris Speaker
KANSAS CITY ROYALS
3B George Brett
CF Amos Otis
RF Jermaine Dye
DH Hal McRae
AL WEST
OAKLAND ATHLETICS
SP Rube Waddell (PHA)/Vida Blue (if only OAK)
C Mickey Cochrane (PHA)/Gene Tenace (if only OAK)
1B Jimmie Foxx (PHA)/Jason Giambi (if only OAK)
2B Eddie Collins (PHA)/Mark Ellis (if only OAK)
3B Home Run Baker (PHA)/Josh Donaldson (if only OAK)
CF Al Simmons (PHA)/Dwane Murphy (if only OAK)
SEATTLE MARINERS
CP J. J. Putz
1B John Olerud
LF Phil Bradley
TEXAS RANGERS
2B Ian Kinsler
RF Ruben Sierra
HOUSTON ASTROS
CP Billy Wagner
1B Jeff Bagwell
2B Craig Biggio
3B Alex Bregman
CF Cesar Cedeno
LOS ANGELES ANGELS
SP Nolan Ryan
2B Bobby Grich
SS Jim Fregosi
3B Troy Glaus
CF Mike Trout
RF Tim Salmon
NL
NL EAST
ATLANTA BRAVES
SP Kid Nichols (BSN)/Greg Maddux (if only ATL)
2B Tony Cuccinello (BSN)/Marcus Giles (if only ATL)
SS Rabbit Maranville (BSN)/Rafael Furcal (if only ATL)
3B Eddie Matthews (MLN)/Chipper Jones (if only ATL)
LF Sid Gordon (BSN)/Chipper Jones (if only ATL)
CF Dale Murphy
RF Hank Aaron
PHILADELPHIA PHILLIES
2B Chase Utley
3B Mike Schmidt
RF Bobby Abreu
MIAMI MARLINS
SP Kevin Brown
CP AJ Ramos
1B Derrek Lee
3B Mike Lowell
WASHINGTON NATIONALS
SP Max Scherzer
CP Chad Cordero
C Gary Carter (MON)/Wilson Ramos (if only WAS)
1B Andres Galarraga (MON)/Adam LaRoche (if only WAS)
2B Jose Vidro (MON)/Daniel Murphy (if only WAS)
SS Ian Desmond
LF Tim Raines (MON)/Juan Soto (if only WAS)
CF Andre Dawson (MON)/Bryce Harper (if only WAS)
RF Bryce Harper
NEW YORK METS
SP Tom Seaver
CP John Franco
SS Jose Reyes
3B David Wright
LF Cleon Jones
NL CENTRAL
MILWAUKEE BREWERS
1B Cecil Cooper
2B Paul Molitor
SS Robin Yount
3B Paul Molitor
LF Ryan Braun
CF Carlos Gomez
PITTSBURGH PIRATES
SP Ed Morris
CP Roy Face
2B Johnny Ray
SS Honus Wagner
3B Bill Madlock
LF Barry Bonds
CINCINNATI REDS
SP Noodles Hahn
1B Joey Votto
2B Joe Morgan
SS Barry Larkin
3B Heinie Groh
CF Vada Pinson
CHICAGO CUBS
CP Lee Smith
1B Cap Anson
SS Ernie Banks
3B Ron Santo
CF Hack Wilson
RF Sammy Sosa
ST. LOUIS CARDINALS
SP Bob Gibson
CP Bruce Sutter
SS Ozzie Smith
3B Ken Boyer
LF Joe Medwick
CF Jim Edmonds
RF Stan Musial
NL WEST
LOS ANGELES DODGERS
SP Sandy Koufax
1B Dolph Camilli (BRO)/Steve Garvey (if only LAD)
2B Jackie Robinson (BRO)/Davey Lopes (if only LAD)
SS Pee Wee Reese (BRO)/Maury Wills (if only LAD)
3B Ron Cey
LF Zack Wheat (BRO)/Gary Sheffield (if only LAD)
CF Duke Snider (BRO)/Willie Davis (if only LAD)
RF Shawn Green
SAN FRANCISCO GIANTS
SP Christy Mathewson (NYG)/Juan Marichal (if only SFG)
CP Robb Nen
2B Jeff Kent
SS Art Fletcher (NYG)/Brandon Crawford (if only SFG)
3B Jim Ray Hart
LF Barry Bonds
CF Willie Mays
RF Mel Ott (NYG)/Bobby Bonds (if only SFG)
SAN DIEGO PADRES
SP Randy Jones
2B Mark Loretta
3B Ken Caminiti
LF Greg Vaughn
CF Cito Gaston
RF Tony Gwynn
ARIZONA DIAMONDBACKS
2B Ketel Marte
SS Nick Ahmed
CF Chris Young
RF Justin Upton
COLORADO ROCKIES
1B Todd Helton
2B DJ LeMahieu
RF Larry Walker