Among the homegrown arms in the Mets rotation, Jonah Tong still has the most to prove.

Flashes of dominance have emerged from the 23-year-old rookie, but consistency is lacking. This was evident again on Sunday, when the right-hander fell into an early hole, and his team never recovered in a 7-2 loss to the Phillies at Citi Field.

Nolan McLean, Christian Scott and Zac Thornton have all performed at a high enough level to begin next season in the rotation. The wild card is Tong, who has pitched to a 4.21 ERA in six appearances this season.

In three starts since his recall this month from Triple-A Syracuse, he’s pitched to a 4.60 ERA.

On this day, he allowed four earned runs on five hits and four walks over 4 ²/₃ innings, departing after 95 pitches. It followed a start against the Orioles in which he did not surrender an earned run over six innings.

The Mets, who split the four-game series, finished their home schedule at 36-45. They will play at Texas and Washington this week, with six games to conclude the season.

Tong walked Kyle Schwarber in the first inning and watched the Phillies DH score the first run on Luis Arraez’s sacrifice fly. Alec Bohm’s RBI single widened the Mets’ deficit to 2-0. Bryce Harper also singled in the inning.

Trea Turner’s RBI double in the third inning extended the Phillies’ lead to 3-0 after Schwarber walked leading off. Arraez’s RBI single gave the Phillies their fourth run.

The Mets were overmatched by Cristopher Sanchez, a National League Cy Young award candidate, who allowed two earned runs on six hits over 6 ¹/₃ innings with six strikeouts. Sanchez began the day with a 7.5 bWAR this season –— the highest among all pitchers.

Bo Bichette homered in the sixth for the Mets’ only run against Sanchez.

Brett Baty delivered a pinch-hit RBI single in the seventh that sliced the Phillies’ lead to 4-2.

Kodai Senga allowed three runs in the eighth and was removed after recording only one out.

The right-hander’s appearance was his first since Tuesday, when he surrendered Pete Alonso’s 300th career homer –— a game-tying blast in the ninth inning.