(8/16): Despite having issues with putting runners on base for much of his career, the 40-year-old Rodney earned a one-year contract with the Diamondbacks in the offseason and was named the closer to open the campaign. Rodney has converted 27 of 32 save chances, but hasn't looked overwhelmingly dominant while doing so. He's mostly rebuilt his job security after a rough April, but Rodney is still sitting on a 4.81 ERA for the season and may have less margin for error than he did coming out of spring training. Rodney should be viewed as no more than a middle-tier closing option, at best, but he should remain a quality source of saves with the Diamondbacks representing one of the National League's stronger teams.
Bradley, a former top starting pitching prospect, has emerged as the Diamondbacks' most dominant arm out of the bullpen this season, but manager Torey Lovullo seems content to use him in high-leverage scenarios rather than as a pure ninth-inning man. Even if Bradley isn't in the mix for saves if Rodney is removed from the closer's role at some point, he'll continue to carry plenty of value in deeper leagues thanks to his elite ratios. In addition to his team-high 15 holds, Bradley has posted a 1.33 ERA and 59:11 K:BB over 54 innings this season.
Hernandez looked like a potential closer in waiting for the Diamondbacks in his first stint with the club from 2011 to 2015, but that never ended up materializing over a prolonged period. He's bounced around the league since leaving Arizona, but reemerged as a desired late-inning asset with the Angels, prompting the playoff-contending Diamondbacks to trade for him July 31. With a 2.01 ERA and 9.1 K/9 rate on the season, Hernandez should prove quite dependable as part of the bridge to Rodney.
Chafin had seemingly solidified himself as Lovullo's top setup man after Bradley, though the trade-deadline acquisition of Hernandez might have changed that. Even so, Chafin should remain effective more often than not whenever called upon out of the bullpen. He's supplied a 2.38 ERA and 50:17 K:BB to go with 12 holds over 41.2 innings this season.