"[He] just didn't look like he was very confident out there," manager Bob Melvin said. "The command wasn't near what we've seen in the past, and like I've said, this is a guy we need to have right."
In an effort to get him on track, the D-backs optioned Medders, who was 1-2 with a 4.84 ERA, to Triple-A Tucson and recalled reliever Jailen Peguero.
With the high number of close games the D-backs have been involved in, setup men Brandon Lyon and Tony Pena have racked up a lot of appearances. Melvin had hoped to use Medders in those late-inning spots to take some of the pressure off Lyon and Pena, but with Medders pitching the way he is, that just wasn't possible.
"We know he can [do it], he's done it before in the past, he just needs to go down there get his head right and pitch on a consistent basis," Melvin said. "Get some confidence back and get him back here to pitch in a role where we can rotate him in there."
For now, Juan Cruz will be used in the role that Medders had filled.
New guy on the block: Peguero impressed the staff this spring with his electric fastball and nasty slider, but the reason he was called up had more to do with how he was pitching now.
In 26 games for Tucson, the right-hander was 3-2 with a 1.69 ERA. Over his last 10 appearances, he's allowed just two runs.
"He was throwing very well down in Tucson," farm director A.J. Hinch said. "His strikeout-to-walk ratio was excellent [41-14] and his command has been solid. He is very deserving of an opportunity to pitch in the big leagues."
Right fielder Carlos Quentin was out of the lineup for the second straight night, though it had more to do with Scott Hairston then Quentin.
When Quentin got Thursday night off, Hairston went 2-for-4 with a double and Melvin wanted to let him start another game.
"The way Scotty swung the bat, I thought he deserved another game," he said.
Tracy update: Third baseman Chad Tracy (rib cage) played nine innings for Tucson on Wednesday as part of his injury rehab assignment. The plan is for Tracy to play a full game on Friday night and probably again Saturday.
It's possible he could be activated for Sunday's game, but the team could also choose to wait until Tuesday when it plays at Yankee Stadium. The D-backs will be able to use a designated hitter for the three-game series in New York and Baltimore so that could make it easier for Melvin to get Reynolds, Tracy and Conor Jackson into the lineup at the same time.
"It's nice that when we get him back, I'll be able to maybe even DH him and not have to run him out there for nine innings every day," Melvin said. "We'll be able to get at least one more guy in the lineup which helps for us and add a little more offense. It gives us a chance to get some more guys involved."
Who's your team? There were plenty of Red Sox fans in attendance Friday night, which was obvious when David Ortiz and Manny Ramirez received loud cheers just for running wind sprints in the outfield prior to the game.
"This is one of the better teams in baseball," Melvin said. "They have their traveling sideshow that comes with them which can add a few distractions or excitement, however you want to look at it."
He's back: Left-hander Evan MacLane cleared waivers and remained with Triple-A Tucson.
MacLane had been designated for assignment May 31 when 2006 first-round pick Max Scherzer signed and was added to the 40-man roster.
Up next: The D-backs continue the three-game series with the Red Sox on Saturday with rookie Micah Owings facing off against Julian Tavarez at 6:40 p.m. MST.
Steve Gilbert is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.