"There comes a point where we're all best served by getting [Grilli] out of the hub," Hurdle said. "We'll give Jason the opportunity to get in a few outings ... when we're behind. He can't wait to get out there and work on a couple of things."
"I'm in a little bit of a slump. I'll work through it. It's nothing I can't overcome," Grilli said. "If I can't overcome this, might as well go do something else. We've got plenty of guys who can help me out now, help me get back to where I need to be."
The main guy for that is Melancon, who has substantial closing experience in three of the last four seasons, with Houston in 2011 and with the Bucs in '13 and this year.
Melancon has converted 26 of 34 save opportunities for the Pirates when subbing for Grilli. However, his previous closing stints came when Grilli was disabled -- by a strained right forearm last season and a strained left oblique earlier this season.
"We're very confident of what Mark can do. There could also be an opportunity for Watson. Right now, it's not working for Jason; he's human," Hurdle said.
As a first-time closer at 36, Grilli converted 33 of 35 opportunities in 2013, when he had 74 strikeouts in 50 innings and allowed four home runs. In 18 2/3 innings this season, he has 17 strikeouts and has allowed four home runs.
By stark contrast, Melancon has given up a total of two home runs in 107 regular-season appearances with Pittsburgh. He went more than a calendar year between them -- from April 14, 2013 (the Reds' Joey Votto) to this May 26 (the Mets' Lucas Duda).
Tom Singer is a reporter for MLB.com and writes an MLBlog Change for a Nickel. He can also be found on Twitter @Tom_Singer. This story was not subject to the approval of Major League Baseball or its clubs.