PITTSBURGH — Paul Skenes struck out nine over six solid innings and the Pittsburgh Pirates edged the Miami Marlins 3-2 on Monday night. The 22-year-old Skenes (10-2) allowed one run on six hits, lowering his ERA to 2.10. Skenes also boosted his season strikeout total to 151, a Pirates rookie record, while winning his fourth straight decision. The 6-foot-6 right-hander’s fastball hit 100 mph six times while becoming just the fourth rookie ever to reach 150 strikeouts in 20 starts or less, joining Kerry Wood, Dwight Gooden and Mark Prior. “I think that just goes to the quality of his stuff,” Pirates manager Derek Shelton said.