Mozoltov got the better of Don Cossack in a duel up the straight to take the Racing UK Moscow Flyer Novice Hurdle at Punchestown.
Ruby Walsh enjoyed the run of the race on the Willie Mullins-trained seven-year-old (9-4), who jumped into the lead at the second-last after Starkie had led for most of the Grade Two contest.
He was strongly pressed by Don Cossack, but was quicker away from the final flight and kept the 6-5 favourite at bay by a length.
Mullins said: "Mozoltov has been doing good work at home and I've been waiting for a nice race to get him out instead of taking on one of our own. I didn't think he'd be taking on as good a bunch as these and he has to go into the top drawer.
"I'd imagine we're looking at the Supreme Novices' Hurdle with him and he can only be better on better ground - Ruby said he wasn't at home on that ground today."
The well-backed Colbert Station led on the run-in to land the Pertemps Handicap Hurdle qualifier in the hands of Tony McCoy. The 11-10 favourite, running off a much lower mark than his chase rating, had to work fairly hard to overpower Clashnabrook by two lengths.
Last seen winning the Paddy Power Chase at Leopardstown, the Ted Walsh-trained nine-year-old holds an entry in the John Smith's Grand National.
"I wouldn't say he was mad about the ground, but he jumps and stays. If he is going to run at Liverpool we'll have to keep him ticking over and today served its purpose," said Walsh.
"We'll be looking at races like the Bobbyjo Chase, the Racing Plus Chase and the Red Mills Chase for him next, but his only minus is his inexperience, and he's only had five runs over fences."
Davy Russell landed a double that included Lastoftheleaders (12-1) in the valuable Dan Moore Memorial Handicap Chase, named after winning trainer Arthur Moore's late father. The 10-year-old galloped on strongly to beat Alderwood by two and a quarter lengths in a competitive contest.
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