Boston Red Sox Non Roster Invitees 2020 (Part 1): RJ Alvarez- Has made his Debut in the MLB during his career. Is 28 years old and has played 2 seasons in his major league career. Will be 1 of 11 Pitchers that was not on the roster but invited to spring training. Trevor Hildenberger- Is 29 years old and has made his MLB Debut. Has played 3 major league seasons in his career so far. Tanner Houck- Will be a Pitcher attending Spring Training. Is 23 years old and has an average era of 4.08 in his MILB career. Brian Johnson- Is 29 years old and has played 4 seasons in the majors throughout his career so far. Has an average era of 4.74 throughout his major league career. Mike Kickham- Is 31 years old and has made his MLB Debut in his baseball career. He has played 2 seasons in the majors so far. Will be 1 of the 11 Pitchers in this years Spring Training. Robinson Leyer- Is 26 years old and has not made his MLB Debut. Has played 8 seasons in the minors and so far in his minor league career ...