Adam Dunn made his second consecutive start at first base Tuesday, and if that continues to be his position down the stretch, he can adjust. "The more I play, the more comfortable I'll feel," Dunn said.
"I don't know if this is a permanent deal or what, but it's fine with me."
Manager Bob Melvin played Dunn at first again Tuesday because he said he wanted to keep the same lineup that scored eight runs Monday, although that changed when Justin Upton was a late scratch because of headaches.
Chad Tracy and Tony Clark have played first base most of the last two months, but Tracy is in a 4-for-33 skid and Clark has just one hit in his last 16 at-bats.
Dunn has handled all three ground balls hit his way and has made 14 putouts in his two starts.
He last played first in 2006, but he does have 109 games of experience at first, and played 33 games there in 2005.
"It's going to take some time. I didn't feel that awkward, which is good," Dunn said.
"I really have to remind myself to cover the bag. When the ball is hit to the left side, don't stand and watch," Dunn said.
UPTON A LATE SCRATCH
Upton was taken out of the lineup after feeling a mild headache during running drills before Tuesday's game.
"I didn't feel 100 percent," said Upton, who was removed from Monday's game after being struck behind the right ear by an errant pickoff throw to first base in the eighth inning.
"I felt good all day, but moving around got me a little bit, so I shut it down. You want to go with a guy who is 100 percent."
Upton was replaced by Alex Romero, who returned to the D-Backs on Tuesday - the day major league rosters could expand to 40 players - as one of six call-ups from Triple-A Tucson.
The D-Backs will start their top three pitchers - Dan Haren, Brandon Webb and Randy Johnson - at Los Angeles this weekend, the final series between the two teams this season.
Right-handers Billy Buckner and Leo Rosales, left-hander Doug Slaten and infielders Jamie D'Antona and Josh Whitesell also returned to the D-Backs on Tuesday, a day after Tucson's season ended.
Webb is the Diamondbacks' nominee for the Roberto Clemente Award, given annually to the major leaguer who combines aptitude on the field with a devotion to community work. Webb and his wife, Alicia, in 2004 established the K Foundation, which attempts to improve lives of critically and chronically ill children throughout Arizona. Funding for the foundation surpassed $200,000 in 2008.
Tony Pena will pitch the eighth inning and Chad Qualls the seventh in close games, Melvin said. Pena has not been scored upon in his last nine outings, and Qualls has been scored upon just once in his last 13 games.