Marc Stein of ESPN.com reports that unrestricted free agent point guard Deron Williams will sign with either the Brooklyn Nets or the Dallas Mavericks in free agency. ------------------------------- When NBA free agency begins at midnight July 1, Brooklyn Nets star guard Deron Williams will be choosing from a two-team list that only features the Nets and the Dallas Mavericks, according to sources close to the situation. Sources told ESPN.com on Saturday night that, while this summer's No. 1 free agent remains "up in the air" about which team he'll ultimately chose, Williams already has made the decision to narrow his list of potential destinations to those two franchises. ------------------------------- ed: text edited, bumped to front page