Jacob deGrom (8-7, 2.56 ERA) tries to stop the Mets' five-game skid when he faces Cubs lefty Jon Lester (10-9, 4.49) in a series finale between playoff hopefuls at Citi Field. Last year's NL Cy Young Award winner, deGrom has pitched himself right back into contention this season and leads the league with 207 strikeouts. Major league ERA leader Hyun-Jin Ryu (12-4) looks to rebound from a rough outing when he pitches for the NL West-leading Dodgers at Arizona.