Sloane Stephens, the Eastbourne-bound American, failed to make it five successive French Open 4th Round appearances.
Tsvetana Pironkova was in sensational form on the Paris red clay to hand Stephens a tennis lesson 6-2 6-1.
The #19 seed was in shockingly poor form as the elegant Bulgarian tore her game apart.
Pironkova, the world #102, had already accounted for seeded Italian Sara Errani in the 1st Round at Roland Garros.
Yet in their previous three meetings it had been Sloane who had registered victory so was not expected to progress past the in-form world #25.
Pironkova, who had only once before this tournament won back-to-back French Open main draw matches, was in formidable form from the start.
She blew Sloane off the court with an impressive array of shots, striking early to race away with the opening set for the loss of just two games.
The Bulgarian continued her crafty clay court tactics to destroy the American ace that left the spectators spellbound by both her brilliance and Sloane’s obvious flaws being exposed that lacked the anticipated gruelling rallies.