That was Johnny Damon who wore #18 for the Red Sox between 2002-2005.
Peyton Manning was the only player to have worn number 18 for the Indianapolis Colts. After leaving the team, his number was retired.
He wore number 18.
He wore # 18 with the Steelers.
Paul Scholes wore jersey number 18 for mancunian republic in 2010-2011.
As far as I know Roberto Baggio The Divine Ponytail, always wore jersey number 10. from juventus to the Italian team. [Baggio worn number 18 for A.C.Milan and number 15 for the 1990 World Cup Azzurri Team]
In 2004, first base coach Mick Kelleher wore #18 for the Detroit Tigers.
John Hiller
Peyton Manning wears the number 18.
Anthony Parker :)
Burress Wore 17
According to the NBA website (http://www.nba.com/clippers/roster/index.html), CNN/SI (http://sportsillustrated.cnn.com/basketball/nba/rosters/clippers.html) and ESPN (http://sports.espn.go.com/nba/roster?team=lac).... Nobody... :-)