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Red Sox manager John Farrell said he's not concerned that Koji Uehara's injury will keep him out long (AP photo).

NEW YORK -- Koji Uehara, who has been as dominant in 2014 as he was a year ago, wasn't available to close out the Boston Red Sox's 4-2 win over the New York Yankees on Friday night.

Uehara felt shoulder stiffness when he was throwing long toss before the game and was held out for precautionary reasons.

"It's not something I feel all the time," Uehara said. "It's not pain. It's tightness when I throw. I feel it."

"We felt it was best to stay away from him," manager John Farrell said. "Just precautionary. This will be a day to day type thing and we'll check on him tomorrow and his availability."

Farrell said he's not concerned that Uehara's injury will keep him out long. The Red Sox have no plans to send him back to Boston for examination.

"Based on what Koji's expressed as far as the stiffness, this doesn't seem to be a one-pitch injury type thing," Farrell said. "He just felt some stiffness and we wanted to stay away from him."

Edward Mujica, who served as the St. Louis Cardinals' closer for the majority of the 2013 season, pitched a scoreless ninth to earn his first save since last September. Farrell said Mujica will close in Uehara's absence.

"He's got a lot of success in that closer's role," Farrell said. "He pitches with a lot of confidence in that ninth inning."