Prix d'Ispahan
Bigstone began his four-year-old season in the Group One Prix d'Ispahan over 1850 metres at Longchamp in May. Ridden by Olivier Peslier, he won by a neck from the British-trained five-year-old Muhtarram with the favourite Hatoof in fourth place. He then sustained three consecutive defeats, finishing eighth behind Distant View in the Sussex Stakes, fourth behind Ski Paradise in the Prix du Moulin and third to the 66/1 outsider Maroof in the Queen Elizabeth II Stakes.