Pittsburgh Pirates' Josh Harrison,right, drives in a run with a single during the eighth inning of a baseball game in Pittsburgh Thursday, May 22, 2014. The Pirates won 3-1.(AP Photo/Gene J. Puskar)
Pittsburgh Pirates' Edinson Volquez delivers during the first inning of a baseball game against the Washington Nationals in Pittsburgh on Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)
Washington Nationals starting pitcher Blake Treinen delivers during the first inning of a baseball game against the Pittsburgh Pirates in Pittsburgh on Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)
Washington Nationals starting pitcher Blake Treinen delivers during the first inning of a baseball game against the Pittsburgh Pirates in Pittsburgh Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)
Washington Nationals' Ian Desmond rounds third after hitting a solo-home run off Pittsburgh Pirates starting pitcher Edinson Volquez during the fourth inning of a baseball game in Pittsburgh Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)
Pittsburgh Pirates' Edinson Volquez delivers during the first inning of a baseball game against the Washington Nationals in Pittsburgh Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)
Pittsburgh Pirates' Andrew McCutchen drives in a run with a single off Washington Nationals starting pitcher Blake Treinen during the fifth inning of a baseball game in Pittsburgh Thursday, May 22, 2014. (AP Photo/Gene J. Puskar)