The San Antonio Spurs and the Los Angeles Clippers are the latest elite teams to join the race to sign Ray Allen, ESPN.com has learned. The Spurs, meanwhile, have only one open roster spot at the moment. A recent report from ESPN’s Marc Stein has the defending champion Spurs joining a crowded group for the marksman’s services. Allen announced last month that he's still deciding whether he wants to play what would be his 19th NBA season, but that certainly hasn't done anything to limit interest in the 3-point specialist. As ESPN.com reported Friday, they have also registered interest in Mexico star center Gustavo Ayon while remaining hopeful of re-signing reserve center Aron Baynes, whom Australia is relying on heavily at the FIBA World Cup in Spain with Andrew Bogut absent.