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Crown Prosecutor had been placed in two of his three starts, but showed significant improvement to win the mile feature, defeating Swords Drawn by a neck, with the fast-closing Sentimental Miss a nose away in third.
"It was a great ride to go straight to the front with the blinkers on today," Marsh's Racing Manager Todd Pollard said.
"We were about four and a half lengths off (race-rival) Sahar last-start, so we thought we had a lot to make up, but he's come out and led and has just kept going."
"He's a lovely colt, he's got a great physique."
The Medaglia D'Oro colt was purchased for $50,000 from the Woodside Park draft at the Inglis Premier Yearling Sale by Bruce Perry, the racing manager for Petagna who shares in the ownership with Harvey Green.
"He was a bit colty before the start," Pollard said.
"Bruce said we may have to geld him, but I don't think we will now.
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Crown Prosecutor is the best of four winners from Riptide, a half-sister by Encosta de Lago to stakes-winner Cross Current from the family of Group I winner River Dove and Group II winner Headwater, who has his first yearlings at the sales next year.
Blue Gum Farm will offer the yearling half-sister by Street Boss (USA) to Crown Prosecutor at 2019 Inglis Premier as Lot 414.
Crown Prosecutor is the 118th stakes-winner worldwide for Darley shuttler Medaglia D'Oro, who has seven yearlings at Magic Millions, two at Inglis Classic and four for Inglis Premier.
Crown Prosecutor is the 118th stakes-winner worldwide for Darley shuttler Medaglia D'Oro, who has seven yearlings at Magic Millions, two at Inglis Classic and four for Inglis Premier.