Gastelum has put together a 19-inning scoreless streak at Triple-A Memphis and boasts a 25:2 K:BB over that stretch.
Gastelum had one rocky outing back in mid-May during which he allowed six runs in two-thirds of an inning, but despite that appearance he still boasts a 2.45 ERA, 0.94 WHIP and 44:14 K:BB over 40.1 innings overall for Memphis. The 24-year-old right-hander sits in the low-90s with his fastball, but he's known for a devastating changeup that he's used to log a 31.2 percent strikeout rate in the minors. Gastelum is not on the Cardinals' 40-man roster, but is pushing hard for a chance to prove himself in the majors sooner rather than later.