Jean Machi allowed a run in the ninth inning but escaped with his fourth save as the Red Sox won 4-3 over the Yankees on Monday.
Red Sox interim manager Torey Lovullo said Sunday that Jean Machi has overtaken Junichi Tazawa as the club's closer.
Jean Machi earned his third save of the season as the Red Sox bested the Mets on Saturday.
Jean Machi allowed two runs in the ninth inning but still got the save as the Red Sox topped the White Sox 5-4 on Monday.
Red Sox manager John Farrell has indicated that Jean Machi will serve as the team's closer with Koji Uehara (wrist) ruled out for the remainder of the season.
Red Sox claimed RHP Jean Machi off waivers from the Giants.
Giants designated RHP Jean Machi for assignment.
Giants activated RHP Jean Machi from the 15-day disabled list.
Jean Machi (groin) is ready to begin a rehab assignment with Triple-A Sacramento.
Giants placed RHP Jean Machi on the 15-day disabled list, retroactive to June 2, with a left groin strain.
Jean Machi said he lost his pinkie fingernail playing catch Monday but remains able to pitch.
Jean Machi got five outs for his second save of the year in the Giants' 6-2 win Friday.
Jean Machi earned his fifth win in relief after pitching two scoreless innings as the Giants beat the Pirates 11-10 in 13 innings on Monday.
Giants recalled RHP Jean Machi from Triple-A Fresno.