The Red Sox come into the game trailing the New York Yankees by 9.5 games in the AL East while being just two games back of the final wild card spot.
Aaron Cook will be the man on the mound for Boston. The 33-year-old pitched splendidly in his last outing, going seven innings and only allowing one unearned run against the Chicago White Sox in a no-decision. Overall Cook has been effective with a season ERA of 3.34.
Villanueva has appeared in 25 games this year, but Saturday marks only his fourth start. The Dominican is undefeated with a 4-0 mark, and has a sterling 2.68 ERA. In his two July starts, Villanueva is yet to surrender a run in 12 innings, winning both of the games.
If Boston is going to force a rubber game on Sunday, it'll have to break through against the youngster.
Time: 7:10 p.m. ET