CHICAGO (AP) -- Jake Arrieta pitched into the seventh inning and also got a career-high two hits, Anthony Rizzo launched his 16th homer, and the Chicago Cubs beat the St. Louis Cardinals 7-4 Tuesday in the first game of a day-night doubleheader.Rizzo's two-run drive highlighted a four-run eighth after St. Louis pulled within one.Arrieta (9-5) came through on the mound and at the plate as the Cubs won for the sixth time in eight games. The right-hander gave up two runs and seven hits in 6 2-3 innings and improved to 3-0 in his past four starts.Arrieta contributed a pair of singles and scored a run after starting the season 1 for 33.Chris Denorfia had two hits and drove in three runs as Chicago beat St. Louis for the third time in 11 games. He gave the Cubs 2-0 lead with a two-run single in the third off Tyler Lyons (2-1). 
Chicago added a run in the sixth when Arrieta led off with a single and scored on Marcus Hatley's bases-loaded walk to Jorge Soler.The Cardinals cut it to 3-2 while chasing Arrieta in the seventh. Peter Bourjos hit an RBI double with two outs and scored on a single by Xavier Scruggs.Tony Cruz then chased Arrieta with a single in front of a diving Denorfia in left before James Russell struck out pinch-hitter Matt Carpenter to end the rally.The Cubs broke it open in the eighth, with Dexter Fowler driving an RBI double off the center-field wall before Rizzo connected against Randy Choate. Denorfia added an RBI single against Miguel Socolovich that made it 7-2.St. Louis' Mark Reynolds hit a two-run homer off Neil Ramirez in the ninth.Lyons gave up three runs and seven hits over 5 2-3 innings for the Cardinals.
Chicago added a run in the sixth when Arrieta led off with a single and scored on Marcus Hatley's bases-loaded walk to Jorge Soler.The Cardinals cut it to 3-2 while chasing Arrieta in the seventh. Peter Bourjos hit an RBI double with two outs and scored on a single by Xavier Scruggs.Tony Cruz then chased Arrieta with a single in front of a diving Denorfia in left before James Russell struck out pinch-hitter Matt Carpenter to end the rally.The Cubs broke it open in the eighth, with Dexter Fowler driving an RBI double off the center-field wall before Rizzo connected against Randy Choate. Denorfia added an RBI single against Miguel Socolovich that made it 7-2.St. Louis' Mark Reynolds hit a two-run homer off Neil Ramirez in the ninth.Lyons gave up three runs and seven hits over 5 2-3 innings for the Cardinals.
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