Match ends, Athletic Club 0, Barcelona 1.
Luis Suarez scored and Lionel Messi missed the 14th penalty of his career as Barcelona beat Athletic Bilbao in their La Liga opener.
But the treble winners, who cannot sign players until January, lost full-back Dani Alves and midfielder Sergio Busquets to injury.
Messi's penalty kick was saved by Gorka Iraizoz after Gorka Elustondo was deemed to have fouled Suarez.
After the break, Suarez scored the winner from Jordi Alba's cross.
It was the first time in three years the Uruguayan has been able to start a season following biting bans in the past two years.
But Luis Enrique, who has lost Pedro and Xavi from his squad this summer, will be worried about injuries to right-back Alves and midfielder Busquets.
Barca are not allowed to register Arda Turan or Aleix Vidal, or any other summer signings they make, until January because of a transfer ban,
The game will be seen as revenge for Barcelona, who lost 5-1 to Athletic Bilbao over two legs in the Spanish Super Cup in the past two weeks.
Real Madrid played Sporting Gijon immediately afterwards, and drew their match 0-0.
Atletico Madrid beat Las Palmas 1-0 on Saturday, with Antoine Griezmann scoring the only goal.
- 1Iraizoz Moreno
- 10De Marcos Arana
- 3Elustondo UrkolaBooked at 34mins
- 24Balenziaga OruesagastiSubstituted forBóveda Altubeat 50'minutes
- 17Rico MorenoSubstituted forGurpegi Nausiaat 62'minutes
- 7Etxebarria Urkiaga
- 5Eraso GoñiBooked at 37mins
- 25Merino ZuloagaSubstituted forGómez Pérezat 63'minutesBooked at 71mins
- 2Bóveda Altube
- 11Gómez Pérez
- 13Herrerín Buisán
- 18Gurpegi Nausia
- 23Aketxe Barrutia
- 30Lekue Martínez
- 6Alves da SilvaSubstituted forRoberto Carnicerat 19'minutes
- 23VermaelenBooked at 64mins
- 4RakiticBooked at 44mins
- 5BusquetsSubstituted forBartraat 68'minutes
- 9SuárezBooked at 75mins
- 12RafinhaSubstituted forRamírezat 82'minutes
- 1ter Stegen
- 17El Haddadi
- 20Roberto Carnicer
- 27Cámara Mesa
- Carlos del Cerro Grande
- Shots on Target
Second Half ends, Athletic Club 0, Barcelona 1.
Offside, Barcelona. Javier Mascherano tries a through ball, but Sergi Roberto is caught offside.
Attempt saved. Aymeric Laporte (Athletic Club) left footed shot from outside the box is saved in the centre of the goal. Assisted by Elustondo.
Luis Suárez (Barcelona) wins a free kick in the attacking half.
Foul by Elustondo (Athletic Club).
Offside, Barcelona. Ivan Rakitic tries a through ball, but Luis Suárez is caught offside.
Attempt saved. Lionel Messi (Barcelona) left footed shot from the centre of the box is saved in the centre of the goal. Assisted by Ivan Rakitic.
Offside, Barcelona. Lionel Messi tries a through ball, but Luis Suárez is caught offside.
Substitution, Barcelona. Sandro Ramírez replaces Rafinha.
Attempt missed. Ibai Gómez (Athletic Club) right footed shot from the centre of the box is high and wide to the right. Assisted by Eraso with a headed pass.
Attempt missed. Markel Susaeta (Athletic Club) right footed shot from outside the box is high and wide to the left. Assisted by Eraso.
Luis Suárez (Barcelona) is shown the yellow card.
Foul by Luis Suárez (Barcelona).
Gurpegi (Athletic Club) wins a free kick in the defensive half.
Foul by Luis Suárez (Barcelona).
Eraso (Athletic Club) wins a free kick in the defensive half.
Offside, Athletic Club. Aymeric Laporte tries a through ball, but Eraso is caught offside.
Ibai Gómez (Athletic Club) is shown the yellow card for a bad foul.
Ivan Rakitic (Barcelona) wins a free kick on the right wing.