As executives make their final preparations for the draft and engage in serious trade talk over the next 48 hours, Deron Williams’ impending free agency looms large. Four rival executives and a fifth person familiar with Williams’ thinking told CBSSports.com Tuesday that the Mavericks are becoming increasingly worried that the All-Star point guard will stay with the Nets when the free-agent floodgates open Sunday.

While optimists in the Mavs’ camp are holding out hope that they still have a “50-50″ chance of landing Williams, who grew up in Dallas, executives working the phones Tuesday have detected a real concern from the Mavs that Williams will opt to join the Nets in Brooklyn next season. Free agency opens at 12:01 a.m. ET Sunday, and Williams will have a very clear financial decision in front of him.

Under new CBA rules, the Nets can offer Williams a five-year deal worth approximately $100 million — one year and about $26 million more than the Mavs, the only other team the All-Star is believed to be considering.

via Ken Berger of CBS Sports