Zaidpour dug deep to claim the Bar One Racing Hatton's Grace Hurdle at Fairyhouse on an afternoon when Willie Mullins landed a treble.
Ruby Walsh's mount showed a great attitude in going past fellow joint-favourite Voler La Vedette going to the last, after the star mare had moved smoothly to the lead two out, where long-time leader So Young made a mistake.
Zaidpour soon mastered Voler La Vedette, who lost second on the run to the line as Monksland finished well. The winning distance was two and a half lengths.
A clash with Big Buck's looks in the offing for the six-year-old at Cheltenham in March.
Mullins said: "I think he's improved, so we'll go along those lines (Ladbrokes World Hurdle). I doubt he'll take on Hurricane Fly next, but he'll be entered in all those races. He has enough speed for two miles, but he has plenty of stamina, too.
"It was a fantastic result and he's stronger this year. He's good enough to run in a Champion Hurdle, but the obvious thing would be to go over a longer trip.
"It depends on what runners we have, but I'd imagine he'll go further - over two and a half or three miles. Himself and Thousand Stars fall into the same kind of bracket.
"I have to give a lot of credit to Virginie, who rides him out all the time. She does a lot of slow work on him and keeps him right as he had shoulder trouble when we got him."
Stan James cut Zaidpour to 20-1 from 50-1 for the World Hurdle. Spokesman Joseph Burke said: "Zaidpour won his second Grade One in good style and has been cut for a host of Cheltenham objectives. He is 20-1 (from 50-1) for the World Hurdle and 33-1 (from 50-1) for the Champion Hurdle."
Mullins also won with Arvika Ligeonniere in the Drinmore Novice Chase and completed the treble with Outlander, who stayed on strongly to score under the trainer's son Patrick in the concluding bumper.
2 July 2015Pendleton thrilled with first ride
Balding hoping for Park August run
Kirby unscathed in house fire
Pilot charters path to York
Provenance has claims on Sandown
Soapy out to slay Dragon rivals
Creighton discharged from hospital
Spencer rides Gatsby in Eclipse
Postulation checks in at Belmont
Space considered for Ascot return
Charming thoughts turn to Doncaster
Deauville date for Diamond
Mecca's takes Thirsk honours
Dods waits on Angel decision
Soumillon takes Certain ride
Mile on Spear radar
September aim for Tryster
Cup aim for Arab
Time out for Hannon aces
Close encounter excites Doyle
Island to drop in grade
1 July 2015Muir keeps faith with Baz
Lynam ponders dual July raid
Geraghty targets weekend return
Pendleton swaps saddles at Newbury
Latharnach given Goodwood aim
More Stewart woe for Lynam
Time makes all the right moves
Canadian dream for Odeliz
Ground to dictate plans for Ribbons
Walsh remembers 'heavyweight' Kauto
Queen possible for Godolphin debut
Intilaaq in line for return
McCoy salutes 'amazing' Kauto
Nicholls leads Kauto tributes
Star put down after paddock fall
30 June 2015Towcester chief facing BHA charges
Down Royal proud to have seen Kauto
Nicholls leads Kauto tributes
Sad end for super Star
Doyle keen on Beau chance
Pontefract firsts for Hannon
Horn long odds-on for Eclipse
Frustration continues for Tudhope
Globetrotting Glance retired
Package heads for retirement
Falmouth caution for Integral
Stars on Leger course
Chase set for drop in class
Vintage option for Sails
29 June 2015France for Force
Karpino King George plans on hold
Firecrown out for compensation
Prat possible for Estidhkaar
Lowther in Lady's sights
Bay bypasses Eclipse date
Beach life suits red-hot Heffernan
Forever foxes sprint rivals
Diamond sparkles in Pretty Polly
Treve too good at Saint-Cloud
Aquam impresses on debut
Pilot leaves rivals toiling
Kodi has Jean Prat option
Aeolus given French targets
Ervedya to face her elders