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The Reds promoted Petty from Double-A Chattanooga to Triple-A Louisville on Wednesday.
Petty had an up and down season at Chattanooga, but he completed a season-high seven frames in each of his final three starts before the promotion, logging a 2.14 ERA, 0.71 WHIP and 20 strikeouts in 21 innings over that stretch. On the season, the 21-year-old righty logged a 4.39 ERA, 1.35 WHIP and 123:56 K:BB in 127 innings at Double-A. His walk rate spiked to 10.4 percent this season after it had been below six percent at his previous three stops.
