Sources: Free agent Martin to sign with Spurs

— -- Free agent guard Kevin Martin has agreed to sign a deal to join the San Antonio Spurs, according to league source

Sources told ESPN.com that Martin, who cleared waivers early Friday after negotiating a buyout earlier this week with the Minnesota Timberwolves, has chosen San Antonio after being pursued by a number of playoff-chasing teams, including both the Houston Rockets ?and Dallas Mavericks.