 The Mets added deGrom to their 40 @-@ man roster on November 20 , 2013 , to protect him from being eligible in the Rule 5 draft . During the offseason , deGrom improved his mechanics , and learned to throw a curveball . He began the 2014 season with Las Vegas , and had a 4 – 0 win – loss record and a 2 @.@ 58 ERA in his first seven games started . 
