The hosts were within two but Luol Deng threw away a pass, leading to Calderon's fast-break layup. After another turnover, Calderon sank a pair of free throws for a 75-69 lead with 39 seconds left.
Dan Clark's 3-pointer cut it to three, but Calderon answered with two more free throws. A 3-pointer by Nate Reinking made it a two-point game, and again Calderon hit two foul shots. Deng answered with another 3-pointer to make 79-78 with 7.2 seconds to go, but Span inbounded to Calderon and the British couldn't catch him to foul.
Pau Gasol scored 17 and Marc Gasol had 12 for Spain (3-0).
Deng finished with 26 points and Joel Freeland added 25 for Britain.