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**The NBA heats up on Christmas Day with a national TV doubleheader featuring the first meetings this season between Shaq's Heat and Kobe's Lakers, and between the defending champion Spurs and Ben Wallace (left) and the Pistons. Keep up with the league's comings and goings, upsets and trends, with insight and analysis from Jack McCallum, Ian Thomsen and Marty Burns at SI.com/nba.
**Perhaps it's only fitting, given its declining TV ratings over the years, that Monday Night Football's 35-year reign on ABC is ending with a ho-hum matchup between the Jets and the Patriots. Things weren't always that way, as SI.com recalls with its gallery of the top 10 games in MNF history at SI.com/photos.
**What do Jack Nicklaus (below), Lance Armstrong, Mark Messier and Jerry Rice have in common? They're all on SI.com's list of the top 20 athletes to call it quits in 2005. To see a gallery of one of the most star-studded groups of retirees from a single year, plus shots of the '05 champions in college and pro sports, go to SI.com/photos.
**The last NFL team to start out 13--0 and lose were the 1998 Broncos, who went on to win Super Bowl XXXIII. Can Edgerrin James (right) and the Colts follow suit? Keep track of playoff seedings and matchups, and read Peter King's Monday Morning Quarterback, at SI.com/nfl.
**Who are the biggest players in the sports media? Check out the Power Rankings in Richard Deitsch's Media Circus column at SI.com/scorecard.