How many races has September Duke won?

September Duke (GB) has yet to win, from 2 archived starts in 2026.

Who trains September Duke?

September Duke (GB) is trained by Andrew Slattery, who saddled the horse on its most recent run on 13 September 2026.

Who is September Duke's sire?

September Duke (GB) is by Sergei Prokofiev (CAN) out of Nuptials (USA), whose sire is Broken Vow.

Who are September Duke's siblings?

Out of Nuptials (USA), September Duke (GB) has 2 other produce in our archive, 1 of them a winner. Most wins: Degale (GB) (1). Highest grade won: Class 5 (Degale (GB)). The wins came over 1m. As at Oct 2026.

Horse profile

September Duke (GB)

2yo colt · Trainer Andrew Slattery · Owner John Martin Oneill

by Sergei Prokofiev (CAN) out of Nuptials (USA) (Broken Vow)

2 runs · 2 courses · from Jun 2026

As at 25 Oct 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily

Last run 13 Sep 2026 · 6th of 15

KTB Profile

Lightly raced 2yo colt with 2 starts since Jun 2026. Finished 6 of 15 at Curragh (IRE) last time. By Sergei Prokofiev (CAN), whose progeny in our archive have won 10.5% of 1,347 runs since Jan 2008.

Based on 2 archived runs · run-style from 2 commented runs since Jun 2026 · updated 25 Oct 2026

0–2Wins / Runs
0%Strike rate
0 (0%)Placed
−2.00£1 level staken=2 at SP
75dAvg between runs

KTB Speed and Rating

KTB Speed

Best recent Speed — no A or B graded figure in the last 3 runs; the figures below carry grade C

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 2 figures · best 58^C · median 51

Going	Runs	Best	Median	Since 25 Oct 2025
Soft	1	—	—	1 run · —
Good	1	—	—	1 run · —

Distance	Runs	Best	Median	Since 25 Oct 2025
6f – 7f	2	58^C	51	2 runs · 58 / 51

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 2 figures from 2 runs · as at 3 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 80^A the best of the last 2 rated runs · Curragh (IRE), 13 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. A, B or C on a run is how much known form was in that race. What this means →

Flat 2 figures · best 80^A · median 68.5

Going	Runs	Best	Median	Since 25 Oct 2025
Soft	1	—	—	1 run · —
Good	1	—	—	1 run · —

Distance	Runs	Best	Median	Since 25 Oct 2025
6f – 7f	2	80^A	68.5	2 runs · 80 / 68.5

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 2 figures from 2 runs · as at 4 Oct 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.

Pedigree intelligence

Sire

Sergei Prokofiev (CAN)

Progeny in our archive have won 10.5% of 1,347 runs since Jan 2008 (202 horses).

Going	Runs	Wins	SR	vs sire	This horse
Firm	12	4	33.3%	+22.8	—
Good to Firm	261	21	8%	−2.5	—
Good	302	28	9.3%	−1.2	0 from 1
Good to Soft	112	13	11.6%	+1.1	—
Soft	93	11	11.8%	+1.3	0 from 1
Heavy	28	5	17.9%	+7.4	—
Standard (AW)	539	60	11.1%	+0.6	—

Distance (all codes)	Runs	Wins	SR	vs sire	This horse
Under 6f	240	31	12.9%	+2.4	—
6f – 7f	823	85	10.3%	−0.2	0 from 2
1m – 1m1f	226	23	10.2%	−0.3	—
1m2f – 1m4f	52	3	5.8%	−4.7	—
1m5f – 2m	4	0	0%	−10.5	—
2m1f – 2m4f	2	0	0%	−10.5	—

Flat and jumps together (all codes) · since Jan 2008 · as at 25 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam

Nuptials (USA) (Broken Vow)

2 siblings in the archive, 1 winner — best of them Degale (GB) (1 win).

The wins came over 1m; the highest grade won is Class 5 (Degale (GB)).

Family form: Degale (GB) finished 3rd of 12 at Wolverhampton (AW), 13 Oct 2026.

Produce	Runs	Wins	Win trips	Best grade
Degale (GB)	18	1	1m	Class 5
Baulac (GB)	14	0	—	—

Too few runs for meaningful splits. The full record is below.

Form

Date	Course	Race	Pos	Btn	Wgt	Spd	KTB	Jockey	SP
2026 · 2 runs
13 Sep 26+75d	Curragh (IRE)	Tattersalls Ireland Super Auction Sales Stakes 6.5f · Yielding · 15 ran Held up in the pack - pushed along and improved into 6th 2f out - held that spot but couldn't find more late on	6/15	nk	9-1	44^C	80^A	Seamie Heffernan	200/1
30 Jun 26	Roscommon	Irish EBF Auction Series Maiden 7.5f · Good · 15 ran Slow into stride - held up towards the back of the field - made no impression - finished 11th	11/15	1	9-5	58^C	57^A	W J Lee	18/1

Quick answers

How many races has September Duke won?: September Duke (GB) has yet to win, from 2 archived starts in 2026.
Who trains September Duke?: September Duke (GB) is trained by Andrew Slattery, who saddled the horse on its most recent run on 13 September 2026.
Who is September Duke's sire?: September Duke (GB) is by Sergei Prokofiev (CAN) out of Nuptials (USA), whose sire is Broken Vow.
What is September Duke's sire's record?: Sergei Prokofiev (CAN)'s progeny in our archive have won 10.5% of 1,347 runs since Jan 2008 (202 horses), Flat and jumps together.
Who are September Duke's siblings?: Out of Nuptials (USA), September Duke (GB) has 2 other produce in our archive, 1 of them a winner. Most wins: Degale (GB) (1). Highest grade won: Class 5 (Degale (GB)). The wins came over 1m. As at Oct 2026.