The 2018 Bowman Draft Mitch Keller features the right-hander at his peak prospect status. He appears on the card in a black uniform, mid-delivery during a bullpen session. Keller helped the Altoona Curve to the Eastern League championship in 2017, then he continued his season in the Arizona Fall League, where he had a 1.52 ERA in six starts and he started the Fall-Stars game. Going into the 2018 season, he was rated as high as 12th among all prospects in baseball, with nearly every source putting him among the top 20 prospects in the game. Keller split the 2018 season between Altoona and Indianapolis, setting himself up for his Major League debut in May of 2019.