Un De Sceaux stretched his unbeaten record to nine with another superb front-running victory in the Prix Leon Rambaud at Auteuil.
Willie Mullins' six-year-old returned to his homeland to clinch the Prix Hypothese at the end of March, just holding the late thrust of French star Gemix, and the two locked horns again at Grade Two level in Paris.
With Ruby Walsh making his comeback from the injuries he suffered at the Cheltenham Festival, Un De Sceaux soon adopted his customary front-running role, albeit slightly more restrained than has been the case in the past, and though the pack closed the gap on the run for home, he skipped over the final flight and took the prize by two and a half lengths with something to spare.
Le Grand Luce finished strongly to grab the runner-up spot, with Saint Du Chenet third and Gemix back in fourth, having failed to quicken in the ground.
Mullins is unsure whether Un De Sceaux will run again before being given a summer break.
He said: "It was a good performance as the ground is very testing and he was staying on well at the end.
"I don't have anything else in mind for him at this stage, but we'll have a look at the French calendar when we get home. I don't think there is anything in Ireland or England for him, so if he is to run again it will probably be in France.
"He doesn't need another run. He's had a great season already and we're not particularly anxious to run him again - unless an opportunity presents itself."
The champion trainer is similarly in no rush to decide on plans for next season with his exciting youngster, who could remain over hurdles or begin a career over fences.
He went on: "That is another day's work and something we'll have a look at later. For the moment we'll enjoy today and another good win for the horse."