Top-rated tennis stars Andre Agassi and Steffi Graf are living together in his Las Vegas home, according to the German newspaper Bild. "They have a lot of time for each other and are bouncing around in the area," Graf's manager Hans Engert told the paper. Last week New York tabloids reported several cozy restaurant sightings of the couple. In the past, Steffi, 30, was romantically linked to tennis player Alexander Mronz and race-car driver Michael Bartels, who has blamed Agassi for the end of his seven-year romance with Graf. Andre, 29, was married to Brooke Shields until last April.