have announced a Super Bowl for each of the four major U.S. television networks, having called five Super Bowls for CBS, three for Fox, and two for ABC prior to joining NBC in 2006; Al Michaels also became the second person (after Pat Summerall on CBS and Fox) to be the lead Super Bowl play-by-play announcer for two different major U.S. networks (ABC and NBC). The Super Bowl was one of two major professional sports championship series NBC broadcast in 2009, as it would also broadcast the Stanley Cup Finals. Both championship series involved teams from Pittsburgh winning championships (the Penguins would win the Stanley Cup that year). The NFL has a strict policy prohibiting networks to run ads during the Super Bowl from the gambling industry, and has rejected ads from the Las Vegas Convention and Visitors Authority. It had been reported that if the television program Las Vegas was airing when NBC televised Super Bowl XLIII in 2009, they likely would not have been allowed to promote the series during the entire broadcast. As Vegas ended during the 2007–2008 television season, this was no longer an issue for NBC. With an average U.S. audience of 98.7 million viewers, Super Bowl XLIII was the most-watched Super Bowl in history, and at that point the second-most-watched U.S. television program of any kind (trailing only the final episode of M*A*S*H in 1983; both would be broken by Super Bowl XLIV the following year). However, the Nielsen rating of 42.1, was lower than the 43.3 rating for Super Bowl XLII the previous year. Wild Card Weekend coverage Tom Hammond was initially NBC's secondary play-by-play announcer, calling one of NBC's two games on Wild Card Weekend. Cris Collinsworth called wild card games alongside Hammond until 2008, and took over on a permanent basis for the 2009 season when Madden announced his retirement from broadcasting on April 16, 2009. Prior to this, he served as a studio analyst for NBC's pregame show, Football Night in America. For the 2009 season, Joe Theismann and Joe Gibbs took Collinsworth's place in the booth for the first game of Wild Card Weekend. Andrea Kremer meanwhile, was the sideline reporter. The announcement of Joe Gibbs as one of the color commentators for the Wild Card Saturday playoff games marked Gibbs' return to NBC's NFL coverage; where following his first retirement from the Redskins, he served as an occasional