French Derby hero The Grey Gatsby was well beaten in sixth as Andre Fabre's Gallante produced a shock in the Grand Prix de Paris at Longchamp.
Having to race on a rain-drenched surface and at a mile and a half for the first time, the Kevin Ryan-trained colt never looked entirely happy from quite an early stage and was the first of the market principals to be beaten.
To his credit, Ryan Moore's mount plugged on down the straight, finishing one place behind John Gosden's Marzocco, who had soon taken the Group One field along in the hands of William Buick.
Favourite Prince Gibraltar, an unlucky-in-running third in the French Derby, looked to have all bases covered turning for home but found first Teletext a tough nut to crack before Gallante hit another gear in the Derrick Smith colours to foil Jean-Claude Rouget's hotpot.
Ryan said: "Ryan told me that from the moment he left the gate he knew he was in trouble.
"He just absolutely hated the ground. He ran respectably, I can't say he didn't get the trip - the way he ran his race and the way he finished his race I think he will get a mile and a half no problem.
"But I wouldn't want to run him on soft ground again."
Asked about supplementing for the Prix de l'Arc de Triomphe back at Longchamp in October, Ryan said: "You would have to be brave to supplement for an Arc at that time of the year, but obviously we can wait until quite close to the Arc before making a decision and anything can happen at that time of the year.
"It remains a possibility if we thought the ground was right and he will go for the Juddmonte International at York next.
"Ryan said to me before the race he would look after him and he would know after a furlong if he was handling the ground or not, he gave him a fantastic ride. It was just unfortunate the rain was coming and so much of it."
Gosden was thrilled with the run of Marzocco, and has Doncaster in September in mind.
He said: "I am absolutely delighted with him, he ran a nice race and it's just sad for everyone there was so much rain.
"He ran a solid race and I am going to train him for the Leger."