PITTSBURGH (AP) -- Jake Arrieta pitched seven strong innings, Anthony Rizzo tied a career high with four hits and the Chicago Cubs beat the Pittsburgh Pirates 5-0 on Tuesday night for their sixth straight win.Arrieta (12-6) allowed two singles - Andrew McCutchen in the fourth and Starling Marte in the seventh - while striking out five and walking three.Tommy Hunter and Justin Grimm completed the three-hitter with one inning each as the Cubs (58-47) matched their longest winning streak of the season from May 11-16 and moved 11 games over .500 for the first time since the end of the 2008 season. 
In his last nine starts, Arrieta is 6-1 with a 1.38 ERA. He improved to 5-1 in his career against the Pirates.Rizzo doubled and scored in both the third and fifth innings as the first baseman led the Cubs' 14-hit attack with the fourth four-hit game of his career.Chris Denorfia had three hits while Starlin Castro doubled home Rizzo twice and Jorge Soler drove in the first and last runs with a bases-loaded walk in the first inning off J.A. Happ (4-7) and a single in the sixth.Chicago drew within three games of the National League wild card-leading Pirates (61-44), who remained 5 1-2 games behind the St. Louis Cardinals in the NL Central.Happ had a rocky Pirates' debut, giving up four runs and eight hits in 4 1-3 innings with two walks and six strikeouts. The lefty was acquired in a trade with Seattle last Friday and was 0-1 with a 9.00 ERA in his last four starts with the Mariners.Marte had two hits.The Cubs made it 3-0 in the third when Castro hit his first RBI double and scored on a single by David Ross.Castro greeted reliever Jared Hughes with his second run-scoring double in the fifth.
In his last nine starts, Arrieta is 6-1 with a 1.38 ERA. He improved to 5-1 in his career against the Pirates.Rizzo doubled and scored in both the third and fifth innings as the first baseman led the Cubs' 14-hit attack with the fourth four-hit game of his career.Chris Denorfia had three hits while Starlin Castro doubled home Rizzo twice and Jorge Soler drove in the first and last runs with a bases-loaded walk in the first inning off J.A. Happ (4-7) and a single in the sixth.Chicago drew within three games of the National League wild card-leading Pirates (61-44), who remained 5 1-2 games behind the St. Louis Cardinals in the NL Central.Happ had a rocky Pirates' debut, giving up four runs and eight hits in 4 1-3 innings with two walks and six strikeouts. The lefty was acquired in a trade with Seattle last Friday and was 0-1 with a 9.00 ERA in his last four starts with the Mariners.Marte had two hits.The Cubs made it 3-0 in the third when Castro hit his first RBI double and scored on a single by David Ross.Castro greeted reliever Jared Hughes with his second run-scoring double in the fifth.
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