Neil Walker's first hit as a Met turned out to be the game-winner, a two-run homer in the fourth.
Syndergaard retired 12 straight and 15 of 16 during one stretch. He left after throwing 92 pitches, 60 for strikes.
Right-hander Chris Young started for the Royals and gave up two runs on three hits over five innings. He struck out four.
MOMENTS THAT MATTERED
Thor drops the hammer: The Royals' only extended rally against Syndergaard unfolded in the sixth inning, when they loaded the bases with two outs.