Clarke, 23, owns a 2.25 ERA and 28:8 K:BB over 28 innings with Double-A Jackson this season.
Clarke, who is in his third season as a professional after being selected out of the College of Charleston in 2015, has shown some noticeable growth in a repeat campaign in the Southern League. In addition to making more bats miss, Clarke is limiting the damage from opposing hitters, who are batting just .198 against him. If the 6-foot-4 right-hander is able to maintain his success through midseason, he'd earn strong consideration for a promotion to Triple-A Reno before 2017 draws to a close.