Edwin Díaz pitches during a spring training workout Feb. 19. Imagn Images It left him feeling confident that he was in a good spot with a little over two weeks remaining before Opening Day.

Mets closer Edwin Díaz has had an up-and-down season in returning from his awful knee injury, but maybe he’s reestablished his dominance now.

Diaz’s 15.2 K/9 leads all pitchers who have pitched a minimum of 13 innings, and he is starting to assert himself as one of the best closers in the game. A big aspect of Diaz’s game and ...