Heaney gave up two runs over 7 1/3 innings against the Padres in his last start Monday. He is 0-5 with a 4.97 ERA on the road, and 7-2 with a 2.90 ERA at home this season. Heaney is seeking his first road victory since Sept. 2, 2015, at Oakland.
Perez is coming off a loss to the Yankees on Sunday, when he allowed seven runs on a season-high 11 hits in five innings. The lefty is 0-1 with a 7.50 ERA in two starts this month.