Eddie Matz ESPN Senior Writer
Before Lucas Giolito's MLB debut, Nationals manager Dusty Baker said that his prized prospect was on more a "performance count" than a pitch count. The one count he didn't count on was a pause count. Following the second rain delay of the night - an 85-minute job hat interrupted the game in the bottom of the fourth - Giolito is done, as reliever Yusmeiro Petit took over to start the fifth. As impressive as the 21-year old righty was (4 IP, 1 H, 0 ER), don't be surprised if the Nats take their time activating Stephen Strasburg (out since June 16 with an upper back strain) from the DL.