Marcus Stroman was the biggest winner among the Mets’ arbitration-eligible players on Friday.

The right-hander, who can become a free agent next offseason, received a contract worth $12 million for 2020, as all nine of the Mets’ arbitration-eligible players reached agreement with the club.

Stroman, who arrived from the Blue Jays at the trade deadline, went 4-2 with a 3.77 ERA in 11 starts for the Mets last season, when he earned $7.4 million. Stroman was acquired in large part as insurance against Zack Wheeler leaving through free agency. Last month, Wheeler signed a five-year contract with the Phillies worth $118 million.

Noah Syndergaard ($9.7 million), Michael Conforto ($8 million), Edwin Diaz ($5.1 million), Steven Matz ($5 million), Jake Marisnick ($3,312,500), Brandon Nimmo ($2.175), Seth Lugo ($2 million) and Robert Gsellman ($1.225) were the other Mets players who reached agreements with the club.

Wilmer Flores is the only Mets player over the last decade to take the team to arbitration — he won his case in 2017. Previously, Oliver Perez took the Mets to arbitration and won his case in 2008.

Syndergaard had a down year by his standards, pitching to a 4.28 ERA and 1.23 WHIP in a season he earned $6 million. The right-hander remains under club control through the 2021 season.

Diaz was a major bullpen disappointment in his first season with the Mets, after arriving with Robinson Cano in the deal that sent prospects Jarred Kelenic and Justin Dunn to the Mariners. Diaz pitched to a 5.59 ERA and allowed 15 homers in 58 innings.

Conforto earned $4.025 million last season, in which he slashed .257/.363/.494 with a career-high 33 homers and 92 RBIs.

Marisnick arrived in a trade with the Astros in December. Last season he slashed .233/.289/.411 with 10 homers and 34 RBIs and earned $2.21 million.

Nimmo, Lugo and Gsellman were first-time arbitration eligible players, like Diaz. Nimmo missed most of last season recovering from a bulging disk in his neck, but was productive after returning to the lineup in September. Overall, he slashed .221/.375/.407 with eight homers and 29 RBIs. Lugo emerged as the Mets’ most dependable reliever last season, finishing with a 2.70 ERA and 0.90 WHIP. The right-hander expressed disappointment last month that he likely will remain in the bullpen, following the Mets’ offseason additions of Rick Porcello and Michael Wacha, both veteran starters. Gsellman, who missed the final six weeks of the season with a lat tear, pitched to a 4.66 ERA and 1.37 WHIP last year.