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08/16/09 12:55 AM ET

Byrnes to begin rehab Sunday in Reno

Arizona (54-63) vs. Los Angeles (69-48), 1:10 p.m. MST

PHOENIX -- Eric Byrnes will join Chris Young in the outfield for Triple-A Reno on Sunday, and in the next 10 days, Justin Upton might be there as well. Same for Conor Jackson.

Meanwhile Trent Oeltjen, Gerardo Parra and Alex Romero make up the big league outfield more nights than not.

It's not usually a good sign when your Opening Day outfield is in the Minor Leagues, but that's the way it is for the D-backs these days, who have had to deal with injuries to Byrnes, Jackson and Upton along with the struggles of Young this season.

Byrnes (fractured left hand) may wind up being the first one to come back depending on how quickly his hand can handle swinging the bat every day.

"I want him to get healthy and get some at-bats and get him swinging the bat the way we know he can," D-backs manager A.J. Hinch said. "Depending on how his hand reacts, we'll see how much volume he can handle and whether or not it takes it all the way until Sept. 1 when we expand the rosters or if he makes it back before that."

Upton (strained right oblique) threw for the first time Friday and is doing some rotational drills. The club hopes he can begin a rehab assignment during an upcoming 10-game road trip.

Jackson (Valley Fever) was 0-for-10 in his first three games for Class A Visalia. The fatigue caught up with him a bit Friday and he took the day off.

"I think he's felt the effects of being off for so long," Hinch said. "He was pretty lethargic [Friday]. I think postgames he's pretty exhausted."

Young was sent down for production rather than health issues and he went 4-for-5 in his first action Friday.

"Good first night for him," Hinch said. "We're all noticing. He showed up on the right foot and with the right attitude and got after it [Friday] night."

Pitching matchup
ARI: RHP Yusmeiro Petit (2-6, 5.87 ERA)
Petit could not follow his two exceptional starts with a third, as the red-hot Nationals pounced on him for nine hits and four runs -- three earned -- in four innings. Petit was lifted from the game for a pinch-hitter in the top of the fifth, ending his afternoon at 83 pitches. "I struggled with command," Petit said. "I was leaving the ball up at the plate and they hit it. My command on both sides was not working good."

LAD: LHP Randy Wolf (6-6, 3.43 ERA)
Randy Wolf allowed a third-inning run after a leadoff walk, but otherwise shut down the Giants for eight strong innings and his eighth quality start in his past nine outings. The Dodgers have scored 32 runs in Wolf's past three wins and he now leads the staff in innings pitched. Wolf is 7-3 lifetime against the D-backs, 1-0 this year.

First baseman Brandon Allen, who was acquired from the White Sox last month, was expected to be called up when the rosters expand on Sept. 1, but the way he's swinging the bat, he may speed up that timetable. Allen hit another homer on Friday night for Reno and now has 12 in 124 at-bats since the trade. The D-backs envision Allen being their starting first baseman next season and have discussed sending him to the Arizona Fall League. ... After the first game of the series featured Mark Reynolds and Andre Ethier each getting hit with pitches, Hinch was asked if he expected more players hit to get hit. "Guys get hit every day so I wouldn't expect anything different this weekend," Hinch said. "If guys are getting too close to the plate or feeling too comfortable, pitchers are always trying to disrupt that."

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Up next
• Monday: Diamondbacks (Max Scherzer, 7-6, 3.94) at Braves (Tommy Hanson, 7-2, 3.05), 1:05 p.m. MST
• Tuesday: Diamondbacks (Jon Garland, 6-10, 4.28) at Phillies (Pedro Martinez, 1-0, 5.40), 4:05 p.m. MST
• Wednesday: Diamondbacks (Dan Haren, 12-7, 2.50) at Phillies (Cliff Lee, 10-9, 2.86), 4:05 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.