Yu Darvish pitched six effective innings in his fourth straight win, and the Chicago Cubs beat the St. Louis Cardinals 6-3 on Tuesday night.

Darvish allowed one run and eight hits while improving to 4-0 with a 1.04 ERA since he struggled in his first start of the season July 25 against Milwaukee – matching his career-best win streak. The right-hander struck out seven and walked one.

St. Louis pushed across two runs in the eighth and had runners on the corners when pinch-hitter Andrew Knizner looked at a called third strike from Rowan Wick, ending the inning. Wick then worked the ninth for his fourth save.

Paul Goldschmidt had three hits for St. Louis, including a two-out RBI single in the fifth. But the Cardinals wasted a couple of prime scoring opportunities.

The longtime rivals conclude their unusual five-game series with another doubleheader Wednesday.

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St. Louis ace Jack Flaherty (1-0, 2.57 ERA) will start Game 1 of Wednesday’s doubleheader. Flaherty hasn’t pitched since he threw seven solid innings in a 5-4 victory over Pittsburgh on opening day. Alec Mills (2-1, 2.84 ERA) will get the ball for Chicago in Game 1. Neither team has announced a starter for the second game.