With the win, Arrieta is 18-0 with a 0.75 ERA since Aug. 1 of last season, giving up 12 earned runs over 144 1/3 innings. He helped the Cubs improve to 27-8, their best start since the 1907 team opened with that record. The Pirates have lost eight of their last 11 games.
MOMENTS THAT MATTERED
Breaking through: After being unable to get a hit through three innings, the Pirates came through in the fourth to score two runs. Andrew McCutchen led off the inning with a double to left field before Gregory Polanco singled to move him to third.