Barcelona beat Rayo Vallecano 1-0 in nervy fashion to go top of La Liga on Monday.
Robert Lewandowski's first-half penalty was enough for Hansi Flick's side to edge in front, a lead they held onto despite their visitors causing plenty of problems.
Wojciech Szczesny was called into action on more than one occasion, while Lewandowski and Lamine Yamal were generally starved of service.
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