Top prospect Alec Bohm will likely be joining the Philadelphia Phillies soon after the first week of the season to gain a year of team control, so the only player on the roster yet to debut in the bigs is Ramon Rosso.
Rosso will likely be a multi-inning reliever in low-leverage situations for the Phillies. He has a career ERA in the minors of 2.80, but had a rough 2019, his first above A ball, with an ERA of 4.46. He made just a single appearance in Spring Training, going 5.2 innings and giving up two runs, so he was a bit of a surprise to make the club.
He has a fastball that sits in the low-90s with some cut to it along with a two-plane slider and a serviceable change. Until last season, he has always put up more than three strikeouts per walk, so he has demonstrated he has the ability to strike guys out and avoid too many walks. He is a low ceiling but relatively high floor arm to round out the bullpen.