Diaz was recalled from Triple-A Albuquerque on Monday, Thomas Harding of MLB.com reports.

Diaz struggled in his first cup of coffee in the big leagues, but he's dominated Triple-A hitters to the tune of a 2.13 ERA and an 11.8 K/9. He'll look to carry that success into the Rockies' bullpen as he replaces Zac Rosscup, who was optioned to Triple-A in a corresponding move.

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