Sipp activated, Jennings designated, Guerra acquired

Sipp activated, Jennings designated, Guerra acquired
NEW YORK - As they prepare to open a four-game series against a reeling Mets club, the Nationals are remaking their bullpen on the fly again. The Nats have activated left-hander Tony Sipp off the injured list while also claiming veteran right-hander Javy Guerra off outright waivers from the Blue Jays. Dan Jennings, an in-season acquisition who never found his footing, was designated for assignment to clear one roster spot. They'll need to clear another spot on the 25-man roster for Guerra once...