This article is part of our Minor League Barometer series.
Zac Gallen makes his long-awaited debut after dominating the competition at Triple-A to begin the 2019 campaign. Arguably the biggest riser of the year thus far, Gallen boasts a minuscule 1.77 ERA in the hitter-friendly confines of the Pacific Coast League. Opposing batters are hitting a putrid .153 against the 23-year-old righty, who's impressed with a 112:17 K:BB in 91.1 innings. Though Sandy Alcantara was likely considered the better piece in return for Marcell Ozuna at the time the trade was made, Gallen could end up being the better hurler long-term. Still, with Alcantara, Gallen and the surprising Jordan Yamamoto now in the rotation, Caleb Smith returning soon from injury, and Sixto Sanchez coming through the pipeline, the Marlins could suddenly boast a rather talented starting rotation in the not-so-distant future.
Let's take a look at the rest of the prospect scene in this edition of the Minor League Barometer.
Sherten Apostel, 3B, TEX – Apostel has been getting a lot of buzz in prospect circles lately. The 20-year-old from Curacao is batting .333 with five home runs and 12 RBI over his last 10 games for Low-A Hickory. At 6-foot-4, 215, Apostel is already a physical specimen but also still has room to grow. As a result, his power stroke could eventually explode and his latest binge could be a preview of things to come. He owns a stellar eye at the dish, is not afraid to take a walk, and also doesn't strike out too much.