Blackpool win 7-6 on penalties
Darren Moore missed the crucial penalty as Derby's poor start to the season continued as they went out of the Carling Cup to Blackpool on spot-kicks.
Mo Camara's cross-shot went in to hand Derby a 62nd-minute lead but Kaspars Gorkss headed the game into extra-time.
Craig Fagan restored the Rams's lead with a neat header from Gary Teale's cross but another Gorkss header ensured the match went to a penalty shoot-out.
And Blackpool won through 7-6, Michael Jackson keeping cool for the winner.
Derby: Bywater, Beardsley (Todd 61), Moore, Leacock, McEveley, Teale, Malcolm, Jones, Camara (Pearson 82), Fagan, Earnshaw (Howard 65).
Subs Not Used: Price, Macken.
Goals: Camara 63, Fagan 101.
Blackpool: Evans, Barker, Evatt, Jackson, Gorkss, Forbes, Fox, Flynn (Southern 70), Hills (Hoolahan 48), Vernon (Morrell 70), Parker.
Subs Not Used: Rachubka, Lawlor.
Goals: Gorkss 86, 120.
Ref: Nigel Miller (Durham).