Isaac Romero scored and assisted as Sevilla maintained their perfect start to the season with a 3-1 victory over 10-man Athletic Club at San Mames.
The contest swung decisively in the visitors' favour after just 11 minutes when defender Yuri Berchiche was sent off for hauling down Miguel Sierra outside the penalty area.
Sevilla immediately capitalised on their numerical superiority, with Oso finding the back of the net in the 15th minute to open the scoring.
Athletic mounted a spirited response before the break as Oihan Sancet curled narrowly wide before goalkeeper Odysseas Vlachodimos reacted smartly to save an effort from Williams.
Sevilla head coach Luis Garcia made three changes at half-time to extend his side's control, and the tactical move paid immediate dividends.
Romero fed substitute Chidera Ejuke out wide, allowing the winger to cut into the box and delicately chip goalkeeper Unai Simon in the 50th minute.
The visitors added a third seven minutes later when Oso turned provider, delivering an accurate pass for Romero to finish in clinical fashion.
Athletic pulled a goal back with 20 minutes remaining as centre-back Aitor Paredes pounced on a loose ball from a corner and lashed home.
The hosts could not muster a late comeback, leaving manager Edin Terzic with defensive issues to solve after conceding three times ahead of a daunting trip to champions Barcelona.
The result means Sevilla make it two wins from two in La Liga, sealing their first half-time away lead in 18 league matches in the process.
