Pitchers Ryan Helsley and Tyler Rogers and outfielder Cedric Mullins jumped into a pennant race when they joined the National League-East leading New York Mets in search of the franchise’s first championship since 1986.

The Mets have activated right-handed relief pitcher Ryan Helsley and center fielder Cedric Mullins, both of whom join recent additions Gregory Soto and Tyler Rogers on the Mets’ active roster. And in a corresponding roster move,