Left-hander Zac Curtis led the Midwest League with 33 saves last season. (Photo by Craig Wieczorkiewicz/The Midwest League Traveler)

Left-handed pitcher Zac Curtis was the Kane County Cougars’ closer last year. Today he was called up to the big leagues by the Arizona Diamondbacks after pitching only in High-A this season.

Curtis led the Midwest League and set a Cougars single-season record with 33 saves last year. He posted a 1.33 ERA with 75 strikeouts and 12 walks in 54 innings pitched for Kane County. In eight appearances with the Visalia Rawhide this season, Curtis posted a 5.23 ERA with two saves, 22 strikeouts and five walks in 10.1 innings.

Curtis replaces fellow lefty Keith Hessler, who was designated for assignment. Hessler pitched for the South Bend Silver Hawks in 2012, going 2-5 with a 3.20 ERA, one save, 75 strikeouts and 44 walks in 90 innings (39 games/seven starts).