Nitrogen Looks Unbeatable in the Breeders’ Cup Distaff
She won the Ogden Phipps by 12¾ lengths and ran second against the best males in the country. She's also lost three times at odds-on. Here's why she's the one to beat, and exactly what has to happen for her to lose.
In June, Nitrogen won a Grade 1 at Saratoga by 12¾ lengths and came within three-tenths of a second of the track record. Two months later she took on the best older males in the country and outran nearly all of them.
On paper, she looks unbeatable in the Breeders' Cup Distaff. But she has also lost three times as an odds-on favorite, and those losses tell you something.
Here's the full case: why she's the one to beat, and the specific things that have to go wrong for her to lose on October 31.
The profileWho She Is
Nitrogen is a 4-year-old filly by Medaglia d'Oro, owned and bred by D J Stable and trained by Hall of Famer Mark Casse. Jose Ortiz has been aboard for every start since the 2024 Breeders' Cup, with one exception: John Velazquez rode her in the Whitney. If Ortiz's name sounds familiar, it should. This year he's won the Kentucky Derby and Belmont on Golden Tempo and the Dubai World Cup on Magnitude.
She was last year's Eclipse Award winner as champion 3-year-old filly, and her Alabama win at 1¼ miles means the Distaff's 1⅛ miles is well within her range.
She finished second in last year's Distaff at Del Mar, 5½ lengths behind Scylla. Scylla retired after that race, so the filly who beat her on this stage won't be in the gate.
The formHer 2026 Season
Her year didn't start the way you'd expect from a champion. After an easy win in her opener, she lost twice in a row at Oaklawn as the heavy favorite.
| Date | Race | Odds | Result |
|---|---|---|---|
| Feb 7 | Bayakoa (G3) · Oaklawn | 3-10 | Won by 2¾ W |
| Mar 7 | Azeri (G2) · Oaklawn | 3-10 | 3rd, beaten 1¾ L |
| Apr 11 | Apple Blossom (G1) · Oaklawn | 4-5 | 2nd, beaten 4½ L |
| Jun 5 | Ogden Phipps (G1) · Saratoga | 1-1 | Won by 12¾ · 113 Beyer W |
| Aug 8 | Whitney (G1) · Saratoga · vs. males | — | 2nd to Sovereignty L |
| Sep 25 | Beldame (G2) · Belmont Park | 1-9 | Won by 2¾ W |
The Ogden Phipps: the race that changed everything
Before the Phipps, Casse gave Ortiz a simple instruction: if she breaks sharp, don't be afraid to let her roll. She did. She went straight to the front and set honest fractions, and nobody got close.
Afterward, Casse said something worth remembering: "I think maybe when you're bottled up a little, it doesn't help her." Keep that in mind. It comes back later.
The key raceThe Loss That Tells You the Most
Nitrogen's most impressive race this year might be one she lost. In the Whitney in August, Casse put her against the best older males in training: Sovereignty, Magnitude, Baeza and White Abarrio.
She stumbled at the start, recovered, then outran Magnitude for the lead and carried the field through three-quarters in 1:09.65, faster than her pace in the Phipps. She still held on for second. Only Sovereignty, the reigning Horse of the Year, got past her.
Most fillies never get asked to run against males of that caliber, and the ones who do usually get exposed. Nitrogen didn't. On October 31 she drops back into her own division.
The final prep
Her last start was the Beldame (G2) on September 25, a five-horse field she won by 2¾ lengths at 1-9. Casse chose that spot over other options, including the Jockey Club Gold Cup, and was clear about the plan: the Breeders' Cup "was our goal in the beginning." She shipped to Keeneland on October 7, and Casse says she's doing well.
The case forWhy She Looks Unbeatable
- She's proven against better companyShe led the Whitney against Grade 1-winning males and only Sovereignty passed her. The Distaff field is a step down.
- The distance is right in her wheelhouseThe Distaff is 1⅛ miles, the same trip as the Phipps, the Whitney and the Beldame. She's won at 1¼, so stamina isn't a question.
- She knows KeenelandShe won the Appalachian (G2) there on turf as a 3-year-old, and lost last year's Spinster over this dirt track by only a head.
- She has speed the division can't matchWhen she breaks well and makes the lead, she controls the race and everyone else runs for second.
Give her a clean break and an uncontested lead, and the race may be over at the half-mile pole.
The case againstWhat Has to Happen for Her to Lose
Look at the races she's lost while heavily favored:
| Race | Odds | Result |
|---|---|---|
| 2025 Belmont Oaks (G1, turf) | 2-5 | 2nd by a nose to Fionn |
| 2025 Spinster (G1) · Keeneland | — | 2nd by a head to Gin Gin |
| 2026 Azeri (G2) | 3-10 | 3rd, beaten 1¾ |
| 2026 Apple Blossom (G1) | 4-5 | 2nd, beaten 4½ |
Two of those were photo finishes, so she's hardly been getting blown away. But her two best races of 2026 came when she was on the lead or fighting for it, and her own trainer said being bottled up doesn't help her. That points to three ways she gets beat.
1. She gets pressured or trapped early
Expect Ortiz to let her roll rather than take hold of her, and expect other speed in the field. If she draws inside with speed to her outside, she could get pinned down along the rail, the exact trip that doesn't suit her. The post position draw is the single most important thing to watch.
2. A stalker is waiting to pounce
The filly built for that role is Fully Subscribed, trained by Chad Brown and ridden by Flavien Prat. She was nearly 13 lengths behind Nitrogen in the Phipps, part of a dead heat for second, but she's been a different filly since:
A stalker who's already won at Keeneland this fall, sitting a length or two off a speed duel, is exactly the profile that beats a filly like Nitrogen.
3. The pace collapses and a closer runs them down
If the early duel gets too hot, a deep closer can run past both of them. The interesting candidate is Measure, a late-running 3-year-old filly who is also trained by Mark Casse. She was second by a neck in the Alabama and has been knocking on the door all year. Casse would be happy either way.
If none of those three things happen, she's going to be very hard to beat.
Betting angleHow to Approach Her
It's too early to talk specific bets: the draw and final field aren't set. But the shape of the decision is already clear, and it depends on the draw.
Odds-on favorites don't pay much on their own. When a horse is this likely to win, building exactas with her on top and longer prices underneath is often a better way to find value than trying to beat her.
WatchThe Full Breakdown
Where the real handicapping starts
Once the draw is out and the field is set, that's when the real work begins, and it's exactly what Trackside Edge is built for.
- 4 plays every week: 2 Best Bets and 2 Value Plays, picked from hundreds of races
- A top pick, two contenders, suggested exotics and the full reasoning for each
- A full-card Blueprint every month. October's is the Breeders' Cup, Distaff included
- Access to me and the private member community
- Every top pick tracked as a 1-unit win bet, with the record and ROI posted, good weeks and bad
Bottom lineFinal Take
Nitrogen for the Distaff
- ✓Class Champion; ran 2nd to the Horse of the Year against males
- ✓Distance 1⅛ miles is her best trip; she's won at 1¼
- ?Trip Needs a clean break and the lead; watch the draw
- !Threats Fully Subscribed stalking; a closer like stablemate Measure
Nitrogen has earned the hype. Give her a clean break and the lead, and she might not get caught. For her to lose, something has to go wrong early, so the post position draw is the moment that matters most.
Who do you think can beat her? The draw will tell us a lot.
Quick answersNitrogen & the Distaff FAQ
When is the 2026 Breeders' Cup Distaff?
Saturday, October 31, 2026, at Keeneland. It's a Grade 1 for fillies and mares at 1⅛ miles on the dirt, with a $2 million purse.
Who trains and rides Nitrogen?
Hall of Famer Mark Casse trains her for owner-breeder D J Stable. Jose Ortiz has ridden her in every start since the 2024 Breeders' Cup except the Whitney, where John Velazquez rode.
What was Nitrogen's best race in 2026?
The Ogden Phipps (G1) at Saratoga on June 5. She won by 12¾ lengths in 1:46.93, 0.29 seconds off the track record, and earned a career-best 113 Beyer.
Has Nitrogen run in the Breeders' Cup Distaff before?
Yes. She finished second in the 2025 Distaff at Del Mar, 5½ lengths behind Scylla, who retired after that race.
Who are Nitrogen's biggest threats in the Distaff?
Fully Subscribed, a Chad Brown-trained stalker who has won three straight, including the Spinster at Keeneland on October 3, and any closer who benefits if the early pace gets too fast, such as Casse's own Measure.
Race details as of October 10, 2026, from NYRA, TDN, BloodHorse and America's Best Racing. Odds shown are final odds from past races; Distaff post positions and odds are not yet set. There are no guaranteed winners. Wager responsibly. If you or someone you know has a gambling problem, call 1-800-GAMBLER.
