PITTSBURGH (Interstat) — Ryan O’Hearn hit a grand slam and drove in four runs as the Pittsburgh Pirates edged the Chicago Cubs 8-7 on Sunday afternoon at PNC Park. O’Hearn’s third-inning blast capped a four-run frame that gave Pittsburgh a 7-1 lead. The Cubs responded with three runs in the fourth and one in the eighth, then pulled within one on Seiya Suzuki’s two-run homer in the ninth, but Mason Montgomery closed for his second save. Braxton Ashcraft (10-4) allowed four earned runs over six innings for the win. Jameson Taillon (2-6) took the loss. Esmerlyn Valdez added two hits and two RBIs for the Pirates. Shawn Ross also homered for Pittsburgh. Pete Crow-Armstrong tripled and drove in a run for the Cubs. Attendance was 32,921. The game lasted 2 hours, 26 minutes. The Cubs fell to 59-46; the Pirates improved to 54-52.