The Pirates struggle at Chase Field. They are 2-10 in their last dozen games there against the Diamondbacks.

Now Pittsburgh goes against Brandon Pfaadt, one of the more underrated pitchers in the National League. Pfaadt has made three starts since the All-Star break spanning 17 1/3 innings. During this time frame, he's given up only one run and 11 hits. He has a 3.09 home ERA.

Marco Gonzales gets the start for the Pirates. The lefty is working his way into shape after coming back from injury. He's allowed three runs and 13 hits in his last 9 2/3 innings. He is several tiers below Pfaadt. The Diamondbacks rank in the top-nine against southpaws in several major hitting categories, including batting average, slugging percentage and OPS.