The Minnesota Timberwolves' attempt to acquire restricted free agent Nicolas Batum from the Portland Trail Blazers apparently has devolved into a grudge match -- at least for the Blazers -- that involves far more than the talented young small forward.

The Timberwolves, league sources say, are prepared to sign Batum to a four-year, $46.4 million offer sheet Sunday after repeatedly trying to trade for him. They have offered as many as three future first-round draft picks and even have dangled small forward Derrick Williams, the No. 2 pick in the 2011 draft.

The Blazers have resisted every overture even though multiple sources say Portland management believes $46.4 million is vastly more than Batum is worth.

Batum's desire to leave Portland began last winter when the Blazers offered him an extension that averaged $5 million per year, a source said. That is less than half of what Minnesota is prepared to offer now.

The Timberwolves also tried to orchestrate a deal that would have sent small forward Kyle Korver to the Blazers, along with the future first-round picks, in a three-way deal involving the Chicago Bulls. That, too, was rejected by Portland.

The Bulls agreed to trade Korver to the Atlanta Hawks as part of a three-team deal involving the Timberwolves on Friday night.

This, of course, is not the first time the Blazers and Timberwolves have had trade talks -- and that's part of the problem. Even before the battle for Batum began, the teams were working to resolve a dispute, a league source said.

The Blazers traded swingman Martell Webster to the Timberwolves in a 2010 draft-night trade for Ryan Gomes and the rights to Minnesota's No. 16 pick, Luke Babbitt. The following fall, Webster had back surgery because of a bulging disk. The Blazers were aware of the injury but did not disclose it before the trade, a league source said. The two teams since have been quietly negotiating compensatory terms but have not been able to reach an agreement.

The Timberwolves released Webster on Friday as part of a cost-cutting measure to open salary-cap room for Batum's offer sheet.