Gio Gonzalez. (AP Photo/Alex Brandon)

The Nationals are riding a four-game winning streak and turn to left-hander Gio Gonzalez (6-9, 4.00 ERA) on Saturday night against the Pirates. Gonzalez has a 5.47 ERA in his five starts since the all-star break, and a 3.45 ERA since he returned from the disabled list in mid-June. He hasn’t completed five innings in three of the past five starts. Left-hander Jeff Locke (4-3, 3.98 ERA) starts for the Pirates. The lineups are here. As always, discuss the game below.