PHOENIX -- Max is back.

The D-backs recalled pitcher Max Scherzer from Triple-A Tucson on Friday. Scherzer went 0-2 with a 2.90 ERA in 10 appearances (three starts) with the D-backs earlier in the season.

The 24-year-old rookie has gone back and forth between starting and relief pitching in both the Majors and the Minors, but he will be used as a reliever for the remainder of the season after being brought up as a starter in the Minors.

"I had that role when I was here, so I've just got to back to my preparation for it," Scherzer said. "That's a bit of an adjustment."

Scherzer started in place of left-hander Doug Davis, who was recovering from thyroid cancer surgery, but spent the majority of his time trying to establish a set role on the pitching staff.

Scherzer was optioned to Triple-A on June 13 so he could build his arm strength back up to become a starter again, but a week later Scherzer went on the Minor League disabled list with shoulder inflammation. He has since regained his strength, as he compiled a 2.72 ERA in 10 starts for the Sidewinders.

"Arm feels fresh, arm feels good," Scherzer said. "I've had pretty good Triple-A outings, so I've just got to try and continue what I was doing down there and do it up here."

Scherzer last pitched on Sunday and is on his normal rest.

General manager Josh Byrnes reiterated that the D-backs' long-term plan is to use Scherzer as a starter.

"We've spent a lot of time and energy to build him up to the capabilities of starting," Byrnes said. "It's not our distinct need at this point.

"The longer view of the 2008 season is that he's really made positive strides as a starter and we're definitely planning to keep him on that track."

To make room for Scherzer, the D-backs optioned reliever Leo Rosales to Triple- A.