The Milwaukee Brewers on Monday placed 31-year-old rookie pitcher Junior Guerra on the 15-day disabled list with right elbow inflammation.

Guerra has been arguably the Brewers' best starter this season, going 7-3 with a 2.93 ERA in 107 1/3 innings (17 starts). The Venezuela native posted a 1.59 ERA in five July starts, which included a career-best 8 2/3 innings-outing July 29. Guerra struggled in his only outing this month, however, yielding four runs and six hits in four inning last Wednesday against the San Diego Padres.

The move is retroactive to Aug. 4.

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The Brewers recalled starter Wily Peralta from Triple-A Colorado Springs to replace Guerra. The 27-year-old Peralta was Milwaukee's opening-day starter, but he went 4-7 with a 6.68 ERA in 13 starts to start the season. The Brewers optioned him to Colorado Springs on June 12, and he's gone 1-3 with a 6.31 ERA in 10 starts with the Sky Sox.