Arrieta makes his second start of the season for the Cubs as they begin a three-game series against the Cardinals at Wrigley Field. Right-hander Eduardo Sanchez was optioned to Triple-A to open a spot for Arrieta.
Arrieta, acquired from the Orioles on July 2, went 2-2 with a 3.56 ERA in seven starts with Iowa. In his only other start with the Cubs against the Milwaukee Brewers on July 30, the 27-year-old Arrieta earned a no-decision after allowing one run and two hits in six innings.
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