Throughout the duration of LeBron James' legendary NBA career, a trade demand from him would've felt like the ultimate version of a worst-case scenario.

NBA free agency officially kicked off on Monday evening as the negotiating window opened for eligible players and all teams across the league at 6 p.m. ET. Monday night was relatively quiet, but the first stunners of the new league year came Tuesday morning.

While they lose key players, the Mavs still have four former No. 1 picks, a rim-running center in Dereck Lively II, another guard in D'Angelo Russell and key wings in Naji Marshall and Max Christie. That's a championship roster.