Roger Federer said Wednesday he wants to team up with long-time rival Rafael Nadal for the final match of his career at the Laver Cup in London. The 20-time Grand Slam winner announced last week he intended to retire after the tournament at London's 02 arena, which starts on Friday. Federer, whose last competitive match was a loss to Hubert Hurkacz in last year's Wimbledon quarter-finals, has been struggling with a knee problem. He will play in the doubles on Friday evening but will not play a singles match in London.