Nationals second baseman Jose Vidro came out of Thursday's 8-7 loss to the Atlanta Braves with inflammation in his right knee, an injury that Manager Frank Robinson believes could severely limit Vidro for the rest of the season.

"Vidro's pretty serious," Robinson said. "It's pretty close to where he won't be able to do much the rest of the year."

Before he came to bat in the top of the fourth, Vidro spoke with Robinson and said he couldn't do much, but wanted to hit. He singled, and was replaced by pinch runner Jamey Carroll. He will have an MRI exam Friday in Washington, and will be closely monitored over the next week.

"There's a chance he might not go out there on a regular basis to play defense," Robinson said. "I think he'll still be able to probably pinch-hit for me, and his bat will be available, but it's doubtful that he'll be able to go out and play defense.

"That's not in stone. We'll just play it by ear."

You Lookin' at Me?

Robinson's staring contest with umpire Jim Wolf in the top of the third inning of the Nationals' 4-3 victory Wednesday was documented on, and timed by, ESPN's "SportsCenter," at 45 seconds. It began when Robinson complained about a strike call to first baseman Nick Johnson.

"I made my call, and I saw him almost come out of the dugout, and I didn't know what he was yelling at, because it wasn't really a questionable pitch," Wolf said Thursday. "I said, 'Are you yelling at me?' And I couldn't understand what he was saying."

Robinson, though, said Wolf was yelling at him to be quiet.

"He kept yapping at me, and I was talking at him, and he's telling me, 'No more,' but he's still yakking at me," Robinson said. "I'm trying to tell him, 'You stop talking to me if I can't talk to you.' "

Robinson's solution: Unleash the iciest of glares. "I kept looking back to see if he was yelling," Wolf said, "and all of a sudden, he just stared at me. I was like, 'What? Are you staring at me?' I felt like [Robert] DeNiro in 'Taxi Driver': 'Are you looking at me?' And he just kept staring, and I was like, 'All right, I'll stare at you back.' "