9. Pete Alonso
This might seem high to some, but I truly believe it's where he belongs. Pete Alonso is already a top ten infielder in the Mets' 59 year history.
Like Delgado, Alonso is one of the better power hitters in franchise history, even with only three years of major league experience.
Alonso has slashed .256/.347/.542 with 106 home runs and 249 RBI in his three seasons. He was an All-Star in 2019 and has won two Home Run Derby titles.
In that historic 2019 season, Alonso slashed .260/.358/.583 with 53 home runs and 120 RBI. He shattered records in the Mets franchise and MLB record books. He won the National League Rookie of the Year award as well.
Alonso broke the Mets single-season home run record which was previously 41 shared by Carlos Beltran and Todd Hundley. Not only did he set the record, he did it in August. And topped it by 12. In his rookie season. Absolutely absurd season.
Not only did he set the Mets single season home run record, he set the MLB record for most home runs in a season for a rookie.
That rookie season was historic, but Alonso has continued to be great since. In the truncated 2020 season Alonso hit 16 home runs and this past season he hit 37. He was third in the National League with his 37 home runs.
Alonso is 9 right now, but will likely be much higher when all is said and done as he is only three years in and will likely be here a long time.