en Sports 15 The final countdown to Super Bowl XLIII is under way as the Arizona Cardinals and the Pittsburgh Steelers arrive at Raymond James Stadium. Olympic great Michael Phelps has acknowledged "regrettable" behavior and "bad judgment" after a photo in a British newspaper showed him smoking marijuana. NBC sells all 67 ads spots during Sunday's Super Bowl for a record $206 million. Rafael Nadal has beaten Roger Federer in the Australian Open final, putting on hold the Swiss star's quest to match Pete Sampras with 14 Grand Slam singles titles. The Pittsburgh Steelers and the Arizona Cardinals hold their final practices before Sunday's Super Bowl. Defensive standouts Bruce Smith and Rod Woodson have been elected to the Pro Football Hall of Fame on their first try, while former commissioner Paul Tagliabue was denied for the third straight year.