ERIE, Pennsylvania (Ticker) -- Dan McKinley hit a grand slam in the 10th inning to lead the Harrisburg Senators past the Erie SeaWolves, 9-4. McKinley hit his first home run of the season after an error, single, and a walk loaded the bases. Yohanny Valera added a solo-shot to cap the five-run inning. Jim Serrano (1-1) allowed one hit over 1 1/3 innings to pick up the win. Talmadge Nunnari had three hits and drove home two runs with a fifth-inning double for Harrisburg, which has won nine of its last 12 games. Jeremy Callier (1-1) took the loss, allowing three runs -- two earned -- over 1 1/3 innings of work. Darren Blakely hit a two-run homer, his sixth blast of the season for Erie, which has dropped three of its last four.