Andre Agassi, Serena Williams and Mardy Fish headline the 37th season of World Team Tennis.
Eight former world No. 1s, including Americans John McEnroe and Pete Sampras and Swedes Bjorn Borg and Stefan Edberg, are to square off against each other in a new Ryder Cup-style competition.
Who is the best athlete in the world? Vote in this second-round matchup!