Dusty Baker remains in the hospital for further tests. (Jason Arnold/Getty Images)

The 63-year-old Baker, who managed the 3,000th game of his career Tuesday against the Cubs, left Wrigley Field two hours before first pitch Wednesday to get chest X-rays to “rule out pneumonia,” according to the team.

Acting manager Chris Speier told the Associated Press that Baker could return to Cincinnati as early as Friday depending on the test results.

“I worry about Dusty and everybody in that clubhouse was really worried last night,” said Speier, who said Baker sounded good when he the two spoke Wednesday night. “You don’t just go to the hospital for a cold or anything like that. And I still feel that way. ... My thoughts are more about Dusty than this game.”

The Reds are a half-game back of Washington for the best record in baseball and maintain an 11-game lead on St. Louis in the National League Central. Cincinnati’s magic number for a second division title in three seasons is down to three after the Reds edged Chicago 6-5 in 11 innings on Wednesday.

Under Baker’s watch, the team effectively weathered a 51-day disabled list stint from 2010 NL MVP Joey Votto and grabbed the division lead for good with a 15-3 record in July.

Baker has a 1,572-1,426 record for his career.

“I’m just glad that out of the 3,000 games, I won more than we’ve lost,” Baker said after Tuesday’s milestone. “That’s a lot of games. That’s not as many as some, but I still got quite a few games left in me.”

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