ATLANTA -- It has been reported for weeks that the Nationals are looking for a center fielder, and Braves outfielder Michael Bourn is a name that could be on the radar.

Bourn, who was hitting .307 entering Saturday's action, is a free agent after this season and might be a possible target for the Nationals.

Asked if he would consider playing for the Nationals, Bourn said, "Well, that's kind of hard to say right now. I'm playing the season with the Atlanta Braves. I'm enjoying my time here. When that time comes, I'll entertain those kind of questions."

But Bourn is aware who the Nationals are. He feels they have one of the best pitching staffs in baseball.

"They are good. They have some real good pitching," Bourn said. "They made some key acquisitions, and they have Gio [Gonzalez] over there now. They bring a good starter every night."

Tracy gets big hit, but exits with injury

ATLANTA -- Nationals infielder Chad Tracy left Saturday's 8-4 victory against the Braves with a serious right leg injury. There is no word on how serious the injury is.

With a runner on second and the game tied at 4, Tracy hit Kris Medlen's 1-0 pitch into the gap in left-center field for a double, scoring Ian Desmond. It was Tracy's Major League-leading ninth pinch-hit RBI of the season. But Tracy came up hobbling while running to second base.

Athletic trainer Lee Kuntz immediately came to Tracy's aid. A couple of minutes later, Tracy left the game. Tracy is expected to have an MRI on Sunday to determine how serious the injury is.

"I'm pretty sore right now. We'll see what happens tomorrow," Tracy said.

The Nationals are not sure if Tracy will go on the disabled list. They are hoping that he simply broke scar tissue after having surgery for a double sports hernia during the offseason.

"He is hoping he just popped some scar tissue, and he also talked to his doctor," Johnson said. "He said that he would wait a couple of days to see if that is the case. I hate to overreact and make a rush to make a roster move. Maybe he is going to be all right in two to three days."

Wang into rotation, Detwiler to bullpen

ATLANTA -- Nationals manager Davey Johnson has decided that right-hander Chien-Ming Wang will be the team's fifth starter, while left-hander Ross Detwiler will be sent to the bullpen as a long man.

The move means that Wang will start Wednesday against the Marlins. According to Johnson, Detwiler took the news hard.

"It's a tough decision, and I think it's tough for the whole ballclub," Johnson said. "I'm reversing roles. It's easy for Detwiler to get warm. He is valuable, because I rank him up there with [Stephen Strasburg], Gio [Gonzalez] and [Jordan Zimmermann]. And I'm going to take care of him out of the bullpen."

Just a few weeks ago, it seemed like a no-brainer that Detwiler would remain in the rotation, but he has not pitched well in his last three starts and has seen his ERA climb from 2.10 to 3.88. It also didn't help that he threw 100 pitches in 4 1/3 innings against the Braves on Friday.

Wang, who started the season on the disabled list because of a strained left hamstring, made his season debut on Friday and pitched well, allowing one run in three innings to earn the win. Wang was slated to start the season as the fifth starter before he was injured in Spring Training.

Johnson said numbers were not the determining factor as to who stays in the rotation. Johnson needed to determine who would fit well in the bullpen.

Had Wang stayed in the bullpen, there was a good chance he would not be available to pitch often. Johnson has often said Wang was going to be treated as if he is a starter if he stayed in the bullpen, which would have meant pitching once every five days.

"You really don't want to tax him when he is just coming back fully from the two years when he was down from the major [shoulder] surgery," Johnson said about Wang. "It would be very hard for me to handle a [former] 19-game winner, who made a great comeback from arm surgery, to have him in the bullpen.

"Here is a guy who has been in pennant fights, too, and knows what the pressure is all about. So it's a good opportunity for him and for us, to have him be in the role he is accustomed to, and that's to start. It doesn't lessen the fact that I think Detwiler is one heck of a pitcher."

But Johnson said he is more concerned about his bullpen because of the injuries and inconsistencies the team has gone through this year.

With Henry Rodriguez no longer the closer, Johnson has decided that Tyler Clippard and Sean Burnett will split the closer's role until right-hander Drew Storen returns to action after the All-Star break.

"I'm more concerned -- not with the starters -- as I am with the bullpen," Johnson said. "I don't like to rearrange the roles. ... I don't like new tricks, but it's a talented bullpen. They are very good in different roles."