If nothing else, the 2015 season is turning into the year of the Yankees prospect. So far we have seen Jacob Lindgren, Slade Heathcott, and Ramon Flores make their MLB debuts and it looks like we'll be adding at least one more name to that list as Mason Williams is the next to get the call. After placing Andrew Miller on the disabled list, New York could have technically recalled outfielder Ramon Flores because he would be replacing an injured player on the roster, but instead they decided to go with Mason and Chris Martin.
Like Slade, the promotion of Mason Williams has been a long and winding journey as he was once considered among the top prospects in the system a few years ago before his value completely plummeted. After a strong 2012 campaign, Mason's offensive game fell apart and he went on to hit .245/.304/.337 in 2013 and .223/.290/.304 in 2014. While his glove was deemed major league ready, many scouts felt like his bat had regressed and that his attitude had gone sour. The Yankees decided to place him on the 40-man roster in the offseason to protect him from the Rule 5 Draft and that seemed like a mistake–the same one they made with Heathcott.
Now in 2015, he's turned his career around by hitting .318/.397/.398 and finally earning his first promotion to Triple-A. Once believed to be an All-Star center fielder in the making, his struggles at the plate have made given him the ceiling of a fourth outfielder. Now that he's hitting again, it should be very interesting to see how he will respond to major league pitching. Maybe something has clicked and he's finally realized his full potential or maybe he's just having a good year and will get exposed after some regular playing time. We'll have to see, because so far–between Slade and Flores–Yankees prospects have not disappointed this year.
To replace Miller in the bullpen, the Yankees have called up Chris Martin, who had pitched to a surprisingly excellent 2.45 ERA in the month of April before soon after going down with an arm injury. While he shouldn't be expected to continue to be the strikeout machine he had been in the beginning of the season, if he's even a serviceable reliever he'll be an upgrade over Esmil Rogers when the team needs a strong right-handed pitcher. Before Miller's injury, the Yankees had five lefties and only two righties in the bullpen (one being Dellin Betances and the other being the longman), so it's good to have another middle reliever in there from the right-hand side.