Kieren Fallon had a career day at Longchamp on Sunday. Rumplestiltskin got things rolling with a gutsy win over Quiet Royal in the Prix Marcel Boussac (Fr-I).The bay filly was boxed in for most of the race, and it appeared she wouldn't be able to extricate herself from the rest of the group. At the furlong marker, Quiet Royal surged to the lead under Olivier Peslier, and it looked as though trainer Criquette Head-Maarek would nab her first group I of the season.Fallon had been biding his time, though, and was able to maneuver Rumplestiltskin into the clear. The pair took the lead inside the final furlong, and won by a length in a driving finish. Deveron finished strongly to take third.Rumplestiltskin now has won five of six career starts, two of them group I victories. She is by the late Danehill, out of the Mr. Prospector mare Monevassia. The dam is a full sister to leading sire Kingmambo. Susan Magnier, Michael Tabor, and the Niarchos family own her in partnership.Trainer Aidan O'Brien stated after the race that Fallon "...gave the filly a masterful ride. We'll see how she is before making any plans, and we might think about the Breeders' Cup."