Miami Heat head coach Erik Spoelstra admitted that his own “horrendous mistake” cost the team in its 123-121 defeat to the Detroit Pistons in the NBA Cup on Tuesday.

With Jimmy Butler missing a second game in a row with a sprained ankle, The Pistons’ bench made a difference, particularly Isaiah Stewart (13 points, 10 rebounds and a big put-back dunk late) and Malik Beasley, who hit four threes on a 19-point night.

Erik Spoelstra, who is widely known as one of the NBA's top coaches, shouldered blame for a brutal timeout infraction, calling it a "serious mental error" in the final seconds of a Miami Heat loss to the Detroit Pistons.