Breeders' Cup Distaff: Nitrogen holds off Fully Subscribed
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Nitrogen was always the one in the $2 million Breeders’ Cup Distaff, whether it was five months ago or turning for home at Keeneland. At no point was the 4-year-old filly anything other than an inescapable titan in the championship event, and when her moment finally came Saturday, she answered the call with breathtaking ease.
“We’ve had an unbelievable year, but if she had gotten beat, I don't know if it would have been as good a year,” trainer Mark Casse said. “I wanted it for her. I’ve won a few Breeders’ Cups before, but she hasn't, and she deserves it.”
In a late stretch drive against Fully Subscribed, who had long been pegged as her only true challenger in the field of seven fillies and mares, Nitrogen and jockey Jose Ortiz never even let the Chad Brown trainee in the picture.
After stalking in third early, the 3-5 favorite kicked clear on the far turn and edged away with overwhelming determination from there, drifting out slightly but easily holding by two lengths at the end. She completed the 1 1/8-mile distance in 1:48.90 and paid $3.58 to win.
“She felt great,” Ortiz said. “She broke well, let me put her in a good position, and she relaxed. When I asked her to go, she was full of run.”
Ortiz, who was unseated in the fifth race at Keeneland on Friday and wheeled to first aid in a stretcher, quickly recovered for two Breeders’ Cup victories on Saturday, winning the Distaff with Nitrogen and Filly and Mare Turf with Kathynmarissa. He has now earned eight career Breeders’ Cup victories, while Casse now has seven.
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Fully Subscribed, who advanced from a distant fourth with a furious rally under Flavien Prat, charged down the center and then angled in for another belated try, but she eventually settled for second, the closest witness to history.
“I’m very pleased with the ride and the trip — she was just second-best,” Brown said, shortly after explaining he did not want Prat to try to cut the corner. “I’m happy we closed the margin from the [Grade 1 Ogden Phipps] and my filly was a much better opponent for Nitrogen today, but she still fell short of what it takes to beat her.”
Super Corredora, the blazing pacesetter, completed the opening quarter-mile in 23.57 seconds and half-mile in 47.04. She and the stalking longshot Eunomia faded to fourth and sixth, respectively, setting the table for Nitrogen’s stablemate, the deep closer Measure, to rally for third at 27-1.
“She’s amazing in herself,” Casse said of Measure. “I'm excited about her 4-year-old campaign, and I think we put away early the filly that should be a champion 3-year old, and that's Counting Stars. So if we keep everybody happy and healthy, I don't know how we beat 2026, but we're going to give it a try.”
To hear Jon Green, co-owner of D J Stable, tell it, Casse knew Nitrogen was special from the beginning. The filly was famously named after a moment early in her life, when the trainer quickly evaluated her and said she “breathes different air,” sending Green to the periodic table in search of a name fit for a superstar. The journey to becoming a Breeders’ Cup champion was not that straightforward, however.
Early in her 3-year-old season, Nitrogen was already a supreme talent on turf, having won three graded stakes while finishing in the money in another three Grade 1 races, including the 2024 Breeders’ Cup Juvenile Turf. Her only run on dirt in her first nine starts was a 17-length romp in last year’s Grade 3 Wonder Again, but that was against two rivals in a race taken off the grass.
It might have taken awhile to decide to make the change for good, with Casse going “back and forth and back and forth” during talks with the connections, but they were all immediately validated when Nitrogen won the Grade 1 Alabama in August 2025. Three months later, she finished second in the Breeders’ Cup Distaff, firmly putting her on the map as a rising star in the division.
But for all the filly already accomplished by the time she turned 4, she did not emerge as a titanic figure until the Ogden Phipps in June, when she defeated Fully Subscribed by 12 3/4 lengths with a 113 Beyer Speed Figure. She then ran against male rivals in the Grade 1 Whitney, finishing second behind Sovereignty. That Bill Mott-trained superstar found no equal in the Breeders’ Cup Classic on Saturday, a race Casse seriously considered for his filly before settling for another attempt in the Distaff.
“We’ve won a Breeders’ Cup,” Casse said. “Now we’ve got to get her into the Hall of Fame.”
Unlike Sovereignty, who will likely retire after his Classic triumph, Casse and Green both said they have every intention of carrying on with Nitrogen. The long-term goal, ambitious and impossibly distant at this point, is a trip to the Breeders’ Cup Classic at Belmont Park next year. The filly already showed she could handle the new track by winning the Grade 2 Beldame, her final prep before the Distaff. But another historic attempt against male rivals could come much sooner at Gulfstream Park.
“She doesn't rest well,” Casse said. “Last year, I took her home, and we were supposed to give her about a month. After two weeks, I called Jon and I said, ‘She’s going to kill herself.’ So we'll see how she comes back. We may look at the [Grade 1 Pegasus World Cup in January]. So we're going to take a different path, for sure, this year coming up.”
Throughout her career, Nitrogen has simply done her thing, regardless of the surface or the sex of her competition. Her connections have been the ones who required courage, trying their hardest to choose the best course from an incalculable number of promising options. The fear has always been that human intervention might hold back a force of nature, but their choices to this point have instead put Nitrogen on a historic trajectory, upon which her championship victory Saturday may not even be the apex.
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