 Complete the following phrase:  Going into the 1981 NFL season, CBS Sports executives decided that John Madden, who had joined the network in 1979 and had worked with Frank Glieber and Gary Bender Pat Summerall and Madden were first teamed on a November 25, 1979 broadcast of a Minnesota VikingsTampa Bay Buccaneers game in his first two years, was going to be their star NFL color commentator  however, they had trouble figuring out who was going to be his play-by-play partner. At the time CBS had reshuffled their 1 team lineup as Summeralls longtime broadcast partner Tom Brookshier was moved into a play-by-play role teamed with former Detroit Lions legend Wayne Walker, at the time the sports director for CBS affiliate KPIX, and it was not immediately clear if Summerall was going to keep his position or if 2 play-by-play man Vin Scully, whose contract was nearing expiration, was going to be promoted to take over. CBS elected to give both Summerall and Scully chances to work with Madden. Scully worked with Madden for four games in September while Summerall was busy covering the U.S. Open tennis tournament for CBS. Summerall then worked with Madden for four October games as Scully called Major League Baseballs 