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.

If there was one bright side to the loss to the Pistons, it was the Heat star in Herro who scored a whopping 40 points while making 10 shots from deep, along with eight assists, five rebounds, and four steals. While some may say his performance went to waste, he does not have an inch of doubt about his head coach, as shared after the game.

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.

Erik Spoelstra is blaming himself for a "horrendous mistake" after calling a timeout the Miami Heat didn't have with 1.1 seconds left in overtime.

Miami Heat head coach Erik Spoelstra did not hold back when speaking about his costly last-second decision after the Pistons loss.

Erik Spoelstra blamed himself for a "horrendous mistake" after calling a timeout the Heat didn't have with 1.1 seconds left in overtime, costing Miami the game.

Instead, it was a grave mistake by head coach Erik Spoelstra in the dying seconds of the game. Coach Spo called a timeout after the Pistons leveled the game at 121-121. However, the Heat had no timeouts left and it resulted in Spoelstra being slammed with a technical foul as Detroit sealed the game.