CHICAGO - After learning that first baseman Anthony Rizzo possibly could be lost for the rest of the season because of a lower back strain, shortstop Starlin Castro left after suffering a left ankle sprain while sliding at home plate. The Cubs provided ample support for Jake Arrieta with four runs in the first..
At the plate
Rookie sensation Jorge Soler hit an RBI single to left field to score Castro in the first, and Arismendy Alcantara capped a three-run fifth with a two-run home run.
On the mound
Arrieta retired nine consecutive batters after allowing an RBI single to Ryan Braun in the third.
In the field: Rookie Javier Baez moved from second base to shortstop after Castro left the game and handled an inning-ending double play in the eighth.
100 ï¿½ Career appearances by Arrieta.
President Theo Epstein on manager Rick Renteria: "Our No. 1 challenge to him was to help develop young players and to provide an environment for young players and continue to develop and thrive at the big league level, and that's easier said than done. He's done a fantastic job of that."