Prospect Mateo undergoes Tommy John
June, 19, 2013
By Adam Rubin | ESPNNewYork.com
Mateo, a 23-year-old right-hander, made a combined four early season appearances with Class A St. Lucie and Double-A Binghamton before being shut down with elbow inflammation.
Since his pro debut in 2011, he is 11-8 with a 2.55 ERA in 29 appearances (27 starts).