Medina allowed just one hit while striking out four and walking one in 8.1 innings for short-season Class A Williamsport on Monday.
Medina, 19, was making his third start of the season after beginning the year in extended spring training. He was flirting with a no-hitter before giving up a hit with one out in the ninth inning Monday. Medina has yet to allow a run this season and has given up just six hits in 21 innings while striking out nine and walking six.