Hernandez has been working on his changeup in hopes of pitching deeper into games this season, Christina De Nicola of MLB.com reports.
On a per-inning basis Hernandez was excellent last season, backing up his 3.16 ERA with a 1.01 WHIP, 32.1 percent strikeout rate and 4.7 percent walk rate. The main negative from his statline is that he averaged just 4.3 innings per start. The 25-year-old was almost never asked to go a third time through the order, facing just seven batters for a third time and allowing four earned runs while recording just two outs when he did. Hernandez almost exclusively used his fastball and slider last year, throwing his changeup just 5.7 percent of the time, so if the pitch truly has improved it could certainly help him reach the next level.