by Marty Gitlin | CBSSports.com
Mariners pitching prospect Edwin Diaz promoted to Double-A
Fast-rising Mariners right-hander Edwin Diaz has been promoted to Double-A Jackson after a fine start with Class A Advanced Bakersfield, per the Tacoma News Tribune. Diaz won both decisions with that team and posted a 1.70 ERA in seven starts. The third-round pick in 2012 allowed just 21 hits in 37 innings with 42 strikeouts and just nine walks.