WASHINGTON — Nationals catcher Wilson Ramos left Washington’s game against the Arizona Diamondbacks with an apparent right leg injury, a potentially damaging blow to the NL East champions.

Ramos was injured on a play at the plate in the sixth inning Monday night when he jumped for a throw and landed awkwardly on his leg. Arizona’s Brandon Drury scored but didn’t make contact with Ramos.

After clutching at his right leg on the ground, Ramos had to be helped off the field by trainers. He was replaced by Pedro Severino.

Ramos tore the ACL and medial collateral ligament in his right knee in 2012.

He is hitting .307 with 22 home runs and 80 RBI this season for the playoff-bound Nationals, who clinched the NL East title on Saturday.

YANKEES: After sitting out the past seven games with a sore right hamstring, second-baseman Starlin Castro entered as a pinch hitter in Monday’s 7-5 win over Toronto, but he did not play in the field.

 Injured right-hander Masahiro Tanaka will be examined by team physician Dr. Christopher Ahmad when the Yankees return home. Tanaka, who has a right forearm strain, has not thrown in the past five days.

DIAMONDBACKS: Right-hander Rubby De La Rosa is trying to avoid a second Tommy John surgery by having a stem cell injection in his ailing elbow.

Manager Chip Hale said De La Rosa met with Dr. James Andrews and decided to try the stem cell injection instead of another major surgery. Hale didn’t have a timeframe for De La Rosa’s return other than he will miss the remainder of the season.

CARDINALS: Shortstop Aledmys Diaz left the club to join Jose Fernandez’s family in a private ceremony. Diaz and Fernandez, the Miami Marlins pitcher who died in a boating accident early Sunday morning, were boyhood friends.

TIGERS: Manager Brad Ausmus said third baseman Nick Castellanos, working through a left-hand issue, could be back before the weekend. He’s currently in the instructional league.

METS: If outfield prospect Tim Tebow is going to have trouble with the curve, it won’t be revealed for at least a few more days.

During the fall Instructional League, the repertoire of Mets pitchers is limited to fastballs and change-ups. At least until Wednesday, when the Mets play the Cardinals, Tebow will not have to contend with breaking balls, which have been the undoing of many a prospect with good swing mechanics.

On Monday, though, Tebow had trouble enough with fastballs and change-ups in his two plate appearances during the Mets’ first intrasquad game, striking out swinging both times.