Starting June 30, Sotheby's will offer the game-winning basketball from the Knicks' improbable Game 4 comeback against the San Antonio Spurs.

Starting June 30, Sotheby's will offer the game-winning basketball from the Knicks' improbable Game 4 comeback against the San Antonio Spurs.

The ball is among a collection of NBA Finals memorabilia headed to Sotheby's, including game-worn jerseys and sections of the Madison Square Garden court.