How it happened: Jake Arrieta was staked to a 2-0 lead thanks to a two-run home run by Luis Valbuena in the second inning, but he couldn’t hold it, giving up four in the fourth. The big blow was a three-run triple by Logan Schafer after Arrieta walked two earlier in the inning. He was done after five innins. Brian Bogusevic hit a solo shot in the sixth to draw the Cubs within one, but that’s as close as they’d come as Jonathan Lucroy tripled home an insurance run in the ninth.
What it means: Arrieta is running out of chances this season to prove he belongs in the rotation for next season. He gave up the lead way too easily and finished with three walks and a hit batter in just five innings. That’s not good enough and his 4.28 ERA are not good enough.
Outside the box: Chang-Yong Lim made his major league debut for the Cubs on the mound in the seventh inning, becoming the 54th player to see action for them this season. That tops the franchise record set last season. He put two players on but induced a ground-ball double play to get out of the jam.