The meeting took place in Seville and ended with a score of 3: 2.
As part of the Catalans, Antoine Griezmann scored a double in the 40th and 77th minutes.
The team from Bilbao responded with goals from Oscar de Marcos (42 ') and Asier Villalibre (90').
At the very beginning of overtime, Iñaki Williams scored the winning goal for Athletic.
At the very end of the game, Barcelona were left outnumbered after Lionel Messi was sent off.
Thus, Athletic won the Spanish Super Cup for the third time in its history.
Earlier it was reported that Real Madrid lost to Athletic and failed to reach the Spanish Super Cup final.