CHICAGO, IL-SUMMER 1998:   Mark McGwire #25 of the St. Louis Cardinals chats with Sammy Sosa of the Chicago Cubs during a game at Wrigley Field in Chicago, Illinois during the 1998 season.  McGwire and Sosa were part of what has been called the &quot;Great Home Run Race of 1998&quot; between the two as they were both attempting to break the single season home run record of 61 held by Roger Maris since 1961.  (Photo by Ron Vesely)