Hagens, 25, combined to go 8-7 with a 4.12 ERA (53 ER in 115.2 IP) in 25 games (19 starts) between Double-A Mobile and Reno this season. He was named the Organizational Player of the Month for May after going 3-0 with a 2.48 ERA (8 ER in 29.0 IP) in 5 starts, and has allowed 3 earned runs or less in 14 of his 19 outing overall.
Over 6 Minor League seasons, Hagens has gone 34-33 with a 4.14 ERA (266 ER in 578.2 IP) in 166 games (82 starts). The 2013 Southern League midseason All-Star was drafted by the D-backs in the sixth round of the 2009 First-Year Player Draft from Merced College.
Chafin, 24, made his Major League debut in the second game of a doubleheader last night @ Indians, becoming the third rookie starter in club history to throw 5.0-plus scoreless innings (3 hits) in his first game (also: Micah Owings on April 6, 2007 vs. Nationals and Jarrod Parker on Sept. 27, 2011 vs. Dodgers).
Chafin was 8-6 with a 3.96 ERA (58 ER in 131.2 IP) in 23 starts between Double-A Mobile and Reno this season.
The D-backs' 40-man roster is now at 39.