Pedro Ciriaco is being tested.
A pleasant surprise this season, even with his recent return to earth, Ciriaco offers plenty to a team. Speed, infield defense, and still a decent contact bat. Now he's getting a shot out in center field as Jacoby Ellsbury gets a night off, and if he can prove a viable glove out there as well, he may have earned himself a 2013 roster spot.
A super utility player who can play shortstop, center field, and can swipe a base or two--he has 15 in 15 attempts this season--is a valuable asset off the bench. That's even more true if there's something to his splits, and his ability to hit lefties at a solid clip is more than just a small sample size illusion.
Still, the lineup looks the worse for his presence--or, really, Aviles' presence when you get back to it--in place of Ellsbury. Against the lefty it's understandable, but it still just doesn't look good.