Seattle Mariners
Catcher: Dan Wilson 10
First Base: Alvin Davis 5 (7)
Second Base: Harold Reynolds 6
Third Base: Adrian Beltre/Kyle Seager 5
Shortstop: Alex Rodriguez 5
Left Field: Raul Ibanez 4 (5)
Center Field: Ken Griffey, Jr. 11 (13)
Right Field: Ichiro Suzuki 9 (11)
Designated Hitter Edgar Martinez 10 (15)
Starting Pitcher: Felix Hernandez 10
10+ Starts: Martinez 15, Griffey, Jr. 13, Suzuki 11, Hernandez 10, Wilson 10
Impressively, Edgar Martinez is tied for the most starts at third base and DH in his career, though most consider him a “DH-only”. Really, the notable players in the 40 year history of the Mariners are all represented on this list, with Ichiro beating out Jay Buhner due to starts in center field.
Miami Marlins
Catcher: Charles Johnson 5
First Base: Derrek Lee 4
Second Base: Luis Castillo 8
Third Base: Mike Lowell 6
Shortstop: Alex Gonzalez 7
Left Field: Jeff Conine 5 (6)
Center Field: Marcell Ozuna 3 (4)
Right Field: Giancarlo Stanton 7
Starting Pitcher: Josh Beckett/Josh Johnson 3
10+ Starts: none
A franchise that has been through as much upheaval in its history as the Marlins expectedly have very short tenure in their Opening Day starters. New ownership will certainly hope a number of the players trotting out for MLB Opening Day on Thursday in Marlins apparel will be challenging these numbers eventually, but with only 3 of the 2017 Opening Day starters even on the Marlins roster to open 2018, it will definitely be a new regime of players.
Next: Mets/Nationals