NEW YORK -- Solid starting pitching performances have served as the backbone of the recent hot streak the Yankees are riding.

But when manager Joe Girardi walks to the mound to call it a day for any of his starters, there's no hesitation to hand over the ball.

And with the numbers the New York bullpen has posted lately, there shouldn't be.

Entering Wednesday, Yankees relievers held a 1.60 ERA over their past 21 games, and Kyle Farnsworth has played a key role in that success. With a perfect eighth inning Tuesday night, Farnsworth has posted 10 straight scoreless outings and held opponents hitless through a nine-inning stretch.

"All the guys down there are throwing the ball great, and Farnsy's been outstanding for us," Girardi said. "Whoever we go to, they're doing the job."

Farnsworth had a shaky start to the season, giving up six earned runs through 12 innings in May. But Girardi showed confidence in his reliever, especially when Joba Chamberlain moved from the bullpen to the starting rotation.

And Farnsworth responded. After posting a 4.50 ERA in May, the right-hander notched a 3.38 ERA in June and has a 0.00 ERA through eight games in July.

"It's always good to have someone that you know back you," Farnsworth said. "I know the ability I have and so does everybody else, so it's good to have a manager who will trust you."

Girardi knows what Farnworth is capable of from firsthand experience. He was the reliever's first catcher in the Major Leagues when they both played for the Cubs.

And while his numbers have given Girardi good reason to trust him, Farnsworth said that's something he doesn't pay attention to.

"I have no idea about the numbers," Farnsworth said. "I just go out there and try to get people out and be aggressive. Just go out there and try to be confident, go out every day and try to repeat my delivery."