A Tom Adeyemi goal minutes before the break has given Leeds United a 1-0 lead over Derby County at half time in their Championship clash at the iPro Stadium.
After a tense opening 20 minutes in which neither side created much in the way of chances, Lewis Cook teed up Gaetano Berardi, whose goal-bound drive was blocked by a Derby body.
Stuart Dallas then stole in behind the Rams' defensive line and poked an effort inches wide of goal, only to be penalised for handball.
Johnny Russell's inviting cross caused chaos in the Leeds box in the hosts' clearest opening, but Chris Martin's shot was eventually blocked and cleared.
Martin then sent a header from a left-wing Russell free kick narrowly wide, but just as it seemed the game would remain goalless at the break, Adeyemi headed home a Dallas cross from close range.