Burgos, 24, has 25 strikeouts in 13 relief appearances (13.2 IP) for the D-backs, leading Major League relievers with a 16.46 strikeouts-per-9.0-innings ratio. He recorded his first career save on May 18 @ Marlins and was the first D-backs rookie to save consecutive games (May 18-19 @ Marlins) since Juan (now J.C.) Gutierrez on Sept. 26-27, 2009 vs. Padres. In 13 appearances, Burgos is 0-2 with a 4.61 ERA (7 ER in 13.2 IP) and a .235 opponents average.
Nuño, 27, will begin his second stint with the D-backs (also May 11-15). In his 1 relief appearance this season, on May 11 vs. Nationals, he had a career-high 8 strikeouts over 6.2 innings, the most by a D-backs reliever since Randy Johnson's 7.0 innings on July 18, 2001 @ Padres. Nuño has gone 3-3 with a 3.38 ERA (19 ER in 50.2 IP) in 8 starts (5 quality) with the Aces.
This is something which was talked about after last night's game, where Burgos failed to retire either of the two batters he faced against the Cardinals in St. Louis. It was thought possible that this could lead to the return of David Hernandez to the active roster, but this Tweet from Hernandez this morning seemed to indicate his rehab would continue for a little longer [last night's minor-league game, in which he was scheduled to appear, having been rained out]
Heading to Knoxville Tennessee...Anything I need to check out?— David Hernandez (@DHern_30) May 26, 2015
We still probably will see Hernandez before much longer, but Burgos going on the disabled list probably now renders a murky roster situation even more unclear in the long-term.