Racing/Longchamp report: Kieren Fallon's mercurial career has always been one of contrasting extremes, but a Group One treble at Longchamp yesterday, highlighted by a truly stunning Prix de l'Arc de Triomphe success on Hurricane Run, will always have its special place.

Fallon's momentous first season as jockey to the Coolmore empire came to a rapturous climax with victories for the Aidan O'Brien-trained pair of classic hopes Horatio Nelson and Rumplestiltskin, but, even more importantly, a first Arc win on a potential giant of modern turf history.

Hurricane Run really did look that good, conjuring up memories of his sire, Montjeu, the 1999 Arc hero, with a dramatic surge from the rear of the field to overcome a less-than-clear run and demolish a quality field with total authority.

"I don't think I've ever ridden a horse with a turn of foot like he has got," beamed Fallon. "I got shuffled back at the start, further back than I wanted to be, but I was lucky to have the horse. The inside is the shortest way around, but I could have gone anywhere on him and won."

Hurricane Run races for Michael Tabor and the Coolmore Stud supremo John Magnier, who bought the colt before his Irish Derby win for a reported figure of close on €10 million. It looks cheap now.

"It seemed like he was in an impossible position, but his turn of foot was second to none, just like Montjeu," said Tabor.

It was four lengths back to Westerner, with last year's winner, Bago, in third and the Epsom Derby victor Motivator in fifth, just ahead of Shawanda. Aidan O'Brien's Scorpion boiled up before the race and eventually faded to 10th.

Hurricane Run's performance will live long in the public memory, and certainly Fallon will hope it remains there longer than the outcome of his intended date with British police later this week when his bail from last year's arrest on suspicion of race-fixing winds up. It certainly deserves to.

Hurricane Run, a sixth winner of France's greatest race for trainer Andre Fabre, had only one behind him for much of the first half of the Arc and looked to be in an almost impossible position as the field galloped to the straight.

Fallon still had so much horse under him, however, that he tried for a run up the rail as his market rivals Motivator and Shawanda started to battle for the lead.

Hurricane Run then tried for a gap between the two, which was cut off, but remarkably still had enough in reserve to switch around and run down the gallant stayer Westerner.

Montjeu, Coolmore's newest super-stallion, looked an even better horse in the first half of his four-year-old campaign, and Magnier confirmed afterwards that his son will race on at four before heading to Co Tipperary.

The bookmakers were in slashing form after both Group One juvenile prizes, and Horatio Nelson is now an 8 to 1 favourite for the Derby after keeping his unbeaten record in the Prix Jean Luc Lagadere.

The colt was briefly headed in the straight by Opera Cape, but fought back well to provide O'Brien with a sixth win in France's biggest two-year-old pot.

"He's still only a baby but he has a great attitude and he's going to be good," reported Fallon, who earlier in the Prix Marcel Boussac had adopted waiting tactics on board Rumplestiltskin.

The filly impressively overcame Quiet Royal and is now as low as 3 to 1 favourite for next year's 1,000 Guineas.

"She's a very special filly and Kieren gave her an unbelievable ride," said O'Brien. "He's a masterful jockey."

There was one Irish disappointment, however, as Jim Bolger's odds-on favourite Alexander Goldrun could finish only third in the Prix de l'Opera behind the outsider Kinnaird.

"When you get a horse like Alexander Goldrun, who does her best every day, nobody can moan too much on the odd day when it doesn't happen for her," said trainer Bolger.

"We have an invitation to Hong Kong and we intend taking it. Obviously if I wasn't happy with her in a month from now we wouldn't be going. As of now I would expect her to put this behind her."