Chafin has made the Diamondbacks' Opening Day roster as the final reliever, Bob McManaman of The Arizona Republic reports.
Manager Torey Lovullo said the final competition was close, but ultimately came down to Chafin's progress over his last few outings. "Inside of each appearance, the fastball command and the velocity were coming back," the skipper said. "The secondary pitches were starting to show a little more consistency and we like the idea of having a second lefty in the bullpen." The southpaw finishes spring play with a 6.10 ERA over 10.1 innings and appears to be in line for low-leverage relief situations as the season begins. Silvino Bracho was reassigned to Triple-A Reno in a corresponding move.