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Chicago Cubs relief pitcher Kerry Wood stands on the field for the national anthem before an interleague baseball game against the Chicago White Sox, Friday, May 18, 2012 in Chicago. Wood, who electrified baseball with a 20-strikeout game as a rookie in 1998 and then became a reliever after his career was slowed by numerous injuries, is expected to retire after pitching one more game for the Cubs. (AP Photo/Brian Kersey)

Chicago Cubs relief pitcher Kerry Wood stands on the field for the national anthem before an interleague baseball game against the Chicago White Sox, Friday, May 18, 2012 in Chicago. Wood, who electrified baseball with a 20-strikeout game as a rookie in 1998 and then became a reliever after his career was slowed by numerous injuries, is expected to retire after pitching one more game for the Cubs. (AP Photo/Brian Kersey)