Butler allowed a run on four hits in six innings with a walk and three strikeouts his last time out in Philadelphia and will face the Marlins for the first time in his career.
He will face a Miami lineup that features two big, but very different weapons in second baseman Dee Gordon, hitting leadoff, and right fielder Giancarlo Stanton, who bats third. Gordon is leading the majors in hitting at .368 and has stolen 20 bases, while Stanton has hit 17 home runs, nearly half of Miami's season total as a team.
Additionally, left-hander Justin Bour will get his 16th start of the season at first base and bat cleanup. Bour is hitting .333/.377/.583 in 77 plate appearances this season with five home runs, second on the team to Stanton.
Opposing Butler on the mound will be 29-year-old righty Tom Koehler. This will be Koehler's 11th start of the season, and he has posted a 4.01 ERA and 4.68 FIP to go with a 1.34 WHIP in 58⅓ innings this season. This will be Koehler's third career start at Coors Field. He allowed four runs in 14 innings combined in the previous two.
Koehler will face a Rockies lineup that features its regular starters,including Ben Paulsen at first base and Brandon Barnes in left field. There is also the resurgent Troy Tulowitzki batting third, with four home runs in his last five games.
First pitch is at 6:40 p.m. Mountain time.