Barcelona leveled in the 58th minute as Eric Abidal sent a cross to the far post where Rodriguez rolled it back for Xavi who slotted it into the corner from close range at Bilbao's San Mames stadium.

Rodriguez scored the winner nine minutes later when he stepped past Athletic Bilbao midfielder Markel Susaeta and hammered a shot inside the near post from 25 yards.

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Barcelona, who have won the Spanish Supercup seven times, will host the return leg on August 23.

The tournament is contested each year between the league champions and the winners of the King's Cup but as Barcelona won both competitions they are facing beaten Cup finalists Athletic.

Barcelona coach Pep Guardiola was without a number of players with attacking midfielder Andres Iniesta and striker Lionel Messi still struggling with thigh injuries.

New signing Zlatan Ibrahimovic is recovering from a left hand injury. The Swedish striker, who joined Barcelona from Inter Milan, is expected to make his debut in next Wednesday's friendly against Manchester City.

Athletic, who are seeking to win their first major trophy since 1984, had no injury problems.

Players and spectators observed a minute's silence before the start of the match in honour of Espanyol captain and defender Daniel Jarque, who died earlier this month week of heart failure while on a pre-season tour of Italy.

Barcelona became the first Spanish side to win the treble - the league, King's Cup and the Champions League - last season.