9. Tom Seaver - 1969
In an article discussing the ten greatest pitching seasons in Mets history, it's to be expected that the greatest pitcher to ever wear a Met uniform would make his way on this list a couple of times at least.
Tom Seaver's first appearance on this list comes in his 1969 season. In his 35 starts, he went 25-7 with a 2.21 ERA in 273.1 innings pitched. 273.1 innings is such an absurd number, and it resulted in Seaver throwing seven or more innings in 32 of his 35 starts.
To finish out the regular season he threw eight straight complete games. He had 19 complete games total and two shutouts.
Thanks to his dominance Seaver won the first Cy Young Award in Mets history, getting 23 of the 24 first place votes. He also came very close to winning an MVP award, as he had the same amount of first place votes as the winner Willie McCovey but didn't get as many higher votes after that.
Seaver of course was an all-star and helped lead the Mets to their first playoff berth which resulted in their first World Series title.