The deal was agreed to Friday before the pitcher and team were to exchange proposed salaries in arbitration. It also set a mark for a pitcher eligible for arbitration for the third time.
The $9.6 million raise broke the record set just hours earlier by Boston Red Sox outfielder Mookie Betts, who got a $9.5 million bump to $20 million for 2019. Two raises of $9 million or more for second-, third- and fourth-time arbitration-eligible players never had happened before Friday.
The Mets reached deals with all six eligible players before Friday's scheduled exchange of salary figures. Pitchers Noah Syndergaard, Zack Wheeler and Steven Matz, outfielder Michael Conforto and catcher Travis d'Arnaud also got contracts for 2019.
Syndergaard agreed to a $6 million deal, doubling his salary.
DeGrom led the majors with a 1.70 ERA in 217 innings and was selected to his second All-Star Game. He was fifth in MVP voting after receiving little run support on a fourth-place squad.
The right-hander went 10-9 with 269 strikeouts in 32 remarkably consistent starts for a team that finished 77-85. The 30-year-old can become a free agent after the 2020 season if the Mets don't sign their electric ace to a multiyear contract by then.
New York sounds open to a long-term deal under new general manager Brodie Van Wagenen, who was deGrom's agent before switching sides and taking the front-office job. Talks could take place soon, though Van Wagenen has said he'll recuse himself from negotiations involving deGrom to avoid a conflict of interest.
Syndergaard went 13-4 with a 3.03 ERA in 25 starts last season but had some trouble staying healthy again. The right-hander logged only 30 1/3 innings in 2017 because of a torn lat muscle. Last year he missed time with a finger injury and an illness, finishing with 155 strikeouts and 39 walks in 154 1/3 innings.
The 26-year-old Syndergaard, an All-Star in 2016, won five of his last six decisions and pitched the first two complete games of his career in September, including a shutout on the final day of the season.
Syndergaard's name was often mentioned in trade talk early this offseason, with the Padres and Marlins among the teams said to be seriously interested. Van Wagenen didn't rule out such a move at first, but eventually indicated the Mets plan to keep Thor at the front of a stingy rotation that is the foundation of the team.
Finally healthy again last season, Wheeler ($5,975,000) is coming off a breakout performance in the second half. He was one of baseball's most dominant pitchers from July on, going 9-1 with a 1.68 ERA in his last 11 starts -- at last fulfilling the considerable promise that made him the sixth overall pick in the 2009 amateur draft by San Francisco. He finished 12-7 with a 3.31 ERA and 179 strikeouts in 29 starts covering 182 1/3 innings.
The right-hander, who turns 29 in May, missed two full seasons following Tommy John surgery in March 2015. He returned in 2017 but that season (3-7, 5.21 ERA) was cut short after 17 starts due to a stress reaction in his pitching arm. Still, he beat the Mets in salary arbitration last February and got a raise from $800,000 to $1.9 million instead of New York's $1.5 million offer.
Wheeler can become a free agent after the upcoming season.
The oft-injured Matz ($2,625,000) finally made it through a full major league season for the first time last year, going 5-11 with a 3.97 ERA in 30 starts. The lefty struck out 152 and walked 58 in a career-high 154 innings.
Matz, the Mets' fourth starter, is 20-26 with a 3.98 ERA in 71 big league outings. The local kid from Long Island earned $577,000 last year and this is his first exposure to salary arbitration. Matz and the Mets are both hoping he's ready to take a significant step forward on the mound.
Conforto ($4,025,000), an All-Star in 2017, missed nearly all of spring training last year following shoulder surgery and got off to a punchless start at the plate. But he rebounded with a big second half and set career highs with 28 homers and 82 RBI in 153 games. He batted .243 with a .797 OPS.
The 25-year-old had nine homers and 29 RBI in September. He made $605,094 last season and is eligible for arbitration for the first time.
D'Arnaud got $3,515,000.
ESPN's Jeff Passan and The Associated Press contributed to this report.