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Horse profile

Sergei Diaghilev (IRE)

2yo colt · Trainer Aidan O'Brien · Owner Westerberg Mrs Magnier M Tabor D Smith
by Wootton Bassett (GB) out of Embellish (IRE) (Galileo)
6 runs · 5 courses · from May 2026
As at 8 Nov 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
2 wins · Gowran Park (IRE) & Curragh Last run 24 Oct 2026 · 5th of 7
KTB Profile

Sergei Diaghilev (IRE) is 2 from 6, including a Listed win. The biggest win we hold: the Coolmore Stud Churchill Stakes at Gowran Park (IRE) (Aug 2026). Each win came on a first visit to the course.

Based on 6 archived runs · run-style from 6 commented runs since May 2026 · updated 8 Nov 2026

KTB Speed and Rating

KTB Speed

Best recent Speed 112 the best of the last 3 graded (A or B) runs · Doncaster, 24 Oct 2026

How fast the horse ran, as points against the day-corrected standard time for its course and distance: 100 is the median GB Class 4 handicap winner on that code; one point is 0.1% of the standard time. A, B or C is how much the day's card could tell us, not how good the run was. What this means →

Flat 6 figures · best 112A · median 82
GoingRunsBestMedianSince 8 Nov 2025
Good4107A784 runs · 107 / 78
Heavy1——1 run · —
Good to Firm1——1 run · —
DistanceRunsBestMedianSince 8 Nov 2025
1m – 1m1f3112A1073 runs · 112 / 107
6f – 7f381C733 runs · 81 / 73

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 6 figures from 6 runs · as at 1 Nov 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 103B the best of the last 3 rated runs · Doncaster, 12 Sep 2026

What the horse achieved in each race, in pounds on the official-rating scale, from the weight carried, the lengths beaten and the race's own level solved across the archive — never the market, never the official rating as a starting point. The headline is the best of the horse's last three rated runs on that code — its best recent day. The KTB Rating on a racecard is a different reading of the same figures: the level the horse has been running to, an average of up to its last six runs with the latest counting most, so the two can differ. A, B or C on a run is how much known form was in that race. What this means →

Flat 6 figures · best 103B · median 97
GoingRunsBestMedianSince 8 Nov 2025
Good4103B984 runs · 103 / 98
Heavy1——1 run · —
Good to Firm1——1 run · —
DistanceRunsBestMedianSince 8 Nov 2025
1m – 1m1f399A973 runs · 99 / 97
6f – 7f3103B973 runs · 103 / 97

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 6 figures from 6 runs · as at 1 Nov 2026 · a record, not a forecast

Both figures are KTB's own, computed from the archive; no vendor rating enters either. Every run's figure is on its form line below with its grade. Grades measure how much the archive could see, never the merit of the run.

The forward record. KTB’s figures on this horse since 10 Oct 2026: top-rated on KTB Rating in 1 run (won 0) · fastest on KTB Speed in 1 run (won 0) · to 24 Oct 2026. Each pick was the figure’s choice before the off, settled against the result the next morning; “did not run” is counted apart. GB and Irish races since 5 Oct 2026.

Run style from 6 analysed runs since May 2026

  • Prominent 3 (50%) · 2 wins
  • Led 2 (33%) · 0 wins
  • Mid-division 1 (17%) · 0 wins

Pedigree intelligence

Sire

Progeny in our archive have won 13% of 5,703 runs since May 2015 (792 horses).

Strongest at trips under 6f (all codes): 16% from 162.

GoingRunsWinsSRvs sireThis horse
Firm200%−13—
Good to Firm5567313.1%+0.10 from 1
Good1,30119114.7%+1.72 from 4
Good to Soft8479911.7%−1.3—
Soft1,03015415%+2—
Heavy3584813.4%+0.40 from 1
Standard (AW)1,60917711%−2—
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f1622616%+3—
6f – 7f1,94630415.6%+2.61 from 3
1m – 1m1f1,92221911.4%−1.61 from 3
1m2f – 1m4f1,28615412%−1—
1m5f – 2m2843612.7%−0.3—
2m1f – 2m4f9433.2%−9.8—
2m5f – 3m900%−13—

Flat and jumps together (all codes) · since May 2015 · as at 8 Nov 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Embellish (IRE) (Galileo)

1 sibling in the archive, 1 winner — best of them Endorsement (IRE) (2 wins).

The wins came over 1m1f–1m4f; the highest grade won is Listed (Endorsement (IRE)).

ProduceRunsWinsWin tripsBest grade
Endorsement (IRE)921m1f–1m4fListed

Record by conditions

GoingRunsWinsSR£1
Good 4 2 50% +1.17
Heavy 1 0 0% −1.00
Good to Firm 1 0 0% −1.00

ClassRunsWinsSR£1
Class 1 5 1 20% −1.50

CourseRunsWinsSR£1
Doncaster 2 0 0% −2.00
Newmarket 1 0 0% −1.00
Gowran Park (IRE) 1 1 100% +2.50
Ascot 1 0 0% −1.00
Curragh 1 1 100% +0.67

DistanceRunsWinsSR£1
1m – 1m1f 3 1 33% +0.50
6f – 7f 3 1 33% −1.33

JockeyRunsWinsSR£1
Ryan Moore 3 1 33% −1.33
Wayne Lordan 2 1 50% +1.50
W. M. Lordan 1 0 0% −1.00

Splits include every sample, however small — muted rows are under 3 runs. A one-from-one record is a fact, not a trend: read the Runs column before the strike rate.

Form

DateCourseRace PosBtn Wgt SpdKTB Jockey SP
2026 · 6 runs
24 Oct 26+14d Doncaster William Hill Futurity Trophy Stakes (Group 1) Class 1 · 1m · Heavy · 7 ran Raced freely in front - pushed along over 2f out - overtaken over 1f out and kept on without quickening to finish 5th 5/7 2¼ 9-3 112A90B W. M. Lordan 13/2
10 Oct 26+28d Newmarket Emirates Autumn Stakes (Group 3) Class 1 · 1m · Good · 7 ran Up with the pace early - shoved into front 2f out - strong effort over 1f out and inside the last - challenged 110yds out - collared near the line to finish second 2/7 nk 9-3 83A99A Ryan Moore 15/8
12 Sep 26+36d Doncaster Betfred Champagne Stakes (Group 2) Class 1 · 7f · Good · 5 ran Set the pace early - pressed and lost front spot 2f out - regained advantage for a stride before 1f out - stayed on to the line but outpaced by winner 2/5 3 9-2 73C103B Wayne Lordan 5/2
07 Aug 26+51d Gowran Park (IRE) Coolmore Stud Churchill Stakes (Listed) Class 1 · 1m · Good · 6 ran Up with the pace and showing some early enthusiasm - moved to the fore just inside 2f out - challenged hard over 1f out but held on - pulled clear in the final 100 yards to win 1/6 9-5 107A97A Wayne Lordan 5/2
17 Jun 26+25d Ascot Windsor Castle Stakes (Listed) Class 1 · 6f · Good To Firm · 25 ran Settled towards the far rail in midfield - began to close the gap approaching the final furlong - drifted left for a stride inside it - flattened out in the last 50 yards to finish ninth beaten 4½ lengths 9/25 nk 9-2 81C97A Ryan Moore 11/4F
23 May 26 Curragh Tally Ho Stud Irish European Breeders Fund (C & G) Maiden 6f · Good · 8 ran Sat handy behind front group - third at halfway - asked for effort over 2f out before hitting front inside final furlong - driven out to prevail 1/8 9-5 53A97A Ryan Moore 4/6F

Quick answers

How many races has Sergei Diaghilev won?
Sergei Diaghilev (IRE) won 2 of 6 archived starts in 2026, a strike rate of 33.3%. Placed 4 times in total (66.7% of starts).
Who trains Sergei Diaghilev?
Sergei Diaghilev (IRE) is trained by Aidan O'Brien, who saddled the horse on its most recent run on 24 October 2026.
Who is Sergei Diaghilev's sire?
Sergei Diaghilev (IRE) is by Wootton Bassett (GB) out of Embellish (IRE), whose sire is Galileo.
What going does Sergei Diaghilev prefer?
Sergei Diaghilev (IRE) has the best record on good going: 2 wins from 4 starts (50%). Only going bands with at least three archived starts are read, so this is a direction rather than a settled preference.
What is Sergei Diaghilev's sire's record?
Wootton Bassett (GB)'s progeny in our archive have won 13% of 5,703 runs since May 2015 (792 horses), Flat and jumps together. Strongest at trips under 6f (all codes): 16% from 162.
Who are Sergei Diaghilev's siblings?
Out of Embellish (IRE), Sergei Diaghilev (IRE) has 1 other produce in our archive, 1 of them a winner. Most wins: Endorsement (IRE) (2). Highest grade won: Listed (Endorsement (IRE)). The wins came over 1m1f–1m4f. As at Nov 2026.

Record shown from May 2026. Our archive holds racing in Great Britain, Ireland and France from January 2005. Any runs before that, or in other countries, are not in it. In-running comments are available from 2024 onward.