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Nationals left-handed starter Gio Gonzalez (17-7, 3.10 ERA) takes the mound against the Chicago Cubs. With a win, Gonzalez could tie New York Mets R.A. Dickey with a major-league leading 18 wins. Gonzalez has won four of his past five starts, posted a 2.23 ERA and is coming off the first complete game shutout of his career. He is opposed by Cubs right-hander Chris Volstad (2-9, 6.06 ERA). The Nationals already have a season-high 7 1/2 game over the Atlanta Braves in the National League East. 

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