A changeup that has ebbed and flowed over Delgado’s career ceded a .500 slugging % in 2017. He relinquished two singles on the pitch in 11.1 innings last season, but the sample isn’t large enough to trust a rebound. The higher usage rate since 2017, however, is a development worth monitoring.
After recording a personal-best fastball velocity (94.2 mph) in 2017, his average tumbled to 91.8 in 10 outings last season. It never corralled many whiffs in the first place (6.6%), so he’ll need to regain some speed upon returning from shoulder and oblique injuries.
Delgado tried reintroducing his sinker after abandoning it throughout 2017, a year in which he set a personal best in FIP (3.16). It vanished again in four appearances after a two-month injury absence to close the season.
Delgado didn’t throw a curveball, which he has tabled since converting to a reliever, to any of his 51 batters faced last season. In 2012 and 2013, the last three years of regular use, the pitch permitted wOBAs of .447 and .364. He has replaced the ineffective offering with a superior slider.
Delgado developed a slider when moving to the bullpen in 2014. It paid dividends at first, but the plus offering suddenly surrendered a .313/.371/.469 slash line in 2017. While its usage percentages declined (25.1, 14.2, 10.9) in the past three seasons, injuries limited him to just 11.1 frames in 2018. The White Sox, who signed him to a minor league deal, could look to rejuvenate the pitch.