CHICAGO, Aug. 23 (UPI) -- Chicago Cubs first baseman Derek Lee is day-to-day after leaving Saturday's 9-2 win over the Washington Nationals with upper back spasms.
The Cubs said on their Web site that Lee hunched over after he struck out to end the fifth inning on an awkward swing and needed assistance from athletic trainer Mark O'Neal.
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He was replaced by Daryle Ward in the sixth.
Lee is batting .290 with 18 homers and 74 RBI this season. His 149 hits are fourth best in the National League.
He missed five games in 2007 because of neck spasms.
