Peters didn't factor into the decision in Tuesday's extra-inning loss to the Phillies, allowing two runs on six hits and four walks over six innings while striking out four.
He's been impressive through his first three big-league starts this September, posting a 2.50 ERA, 1.33 WHIP and 18:9 K:BB in 18 innings. The 25-year-old Peters has positioned himself to compete for a regular spot in the Marlins' rotation next spring, but first he'll face the Brewers at home Sunday.