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Horse profile

Mayfair (IRE)

3yo filly (at last run, May 2024) · Last trainer A P O'Brien · Last owner Derrick Smithmrs John Magniermichael Taborwesterberg
by Justify (USA) out of Clemmie (IRE) (Galileo)
4 runs · 4 courses · from Aug 2023
As at 21 Oct 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
No run recorded since 15 May 2024 — 889 days ago. Our archive can't say whether the horse is still in training.
Last run May 2024 · 5th of 7 Last raced off OR 87
KTB Profile

Mayfair is a filly by Justify out of Clemmie who has yet to win from four starts though she has placed twice. Her best effort came when second of 10 at Dundalk in Apr 2024. She finished fifth of seven in the Tattersalls Musidora Stakes at York in May 2024 off an official rating of 87. All three turf runs came on soft or heavier ground.

Based on 4 archived runs · updated 21 Oct 2026

KTB Speed and Rating

KTB Speed

Best recent Speed 104 the best of the last 3 graded (A or B) runs · Dundalk (AW), 13 Apr 2024

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 4 figures · best 104A · median 81.5
GoingRunsBestMedianSince 21 Oct 2025
Good1———
Standard (AW)1———
Heavy1———
Soft1———
DistanceRunsBestMedianSince 21 Oct 2025
6f – 7f3104A96—
1m2f – 1m4f1———

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 4 figures from 4 runs · as at 3 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 94A the best of the last 3 rated runs · Dundalk (AW), 13 Apr 2024 Official rating 87 at the last run, 15 May 2024

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 4 figures · best 94A · median 85
GoingRunsBestMedianSince 21 Oct 2025
Good1———
Standard (AW)1———
Heavy1———
Soft1———
DistanceRunsBestMedianSince 21 Oct 2025
6f – 7f394A90—
1m2f – 1m4f1———

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

Run style is derived from in-running commentary, which our data provider does not supply for this horse's races.

Pedigree intelligence

Sire
Justify (USA)

Progeny in our archive have won 17.8% of 523 runs since Jan 2008 (98 horses).

Strongest over 6f – 7f (all codes): 23.5% from 149. Weakest over 1m – 1m1f (all codes): 13.8% from 160.

GoingRunsWinsSRvs sireThis horse
Firm100%−17.8—
Good to Firm751520%+2.2—
Good1673018%+0.20 from 1
Good to Soft57915.8%−2—
Soft711622.5%+4.70 from 1
Heavy26311.5%−6.30 from 1
Standard (AW)1262015.9%−1.90 from 1
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f3266.7%+48.9—
6f – 7f1493523.5%+5.70 from 3
1m – 1m1f1602213.8%−4—
1m2f – 1m4f1732514.5%−3.30 from 1
1m5f – 2m34823.5%+5.7—
2m1f – 2m4f4125%+7.2—

Flat and jumps together (all codes) · since Jan 2008 · as at 21 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Clemmie (IRE) (Galileo)

2 siblings in the archive, 2 winners — best of them Unless (USA) (2 wins).

The wins came over 6f–1m2f; the highest grade won is Listed (Unless (USA)).

ProduceRunsWinsWin tripsBest grade
Unless (USA)1321m–1m2fListed
Sweet Chariot (IRE)1416f—

Record by conditions

GoingRunsWinsSR£1
Good 1 0 0% −1.00
Standard (AW) 1 0 0% −1.00
Heavy 1 0 0% −1.00
Soft 1 0 0% −1.00

ClassRunsWinsSR£1
Class 1 1 0 0% −1.00

CourseRunsWinsSR£1
York 1 0 0% −1.00
Dundalk (AW) 1 0 0% −1.00
Curragh 1 0 0% −1.00
Galway 1 0 0% −1.00

DistanceRunsWinsSR£1
6f – 7f 3 0 0% −3.00
1m2f – 1m4f 1 0 0% −1.00

JockeyRunsWinsSR£1
Ryan Moore 3 0 0% −3.00
Seamie Heffernan 1 0 0% −1.00

HeadgearRunsWinsSR£1
Tongue tie 3 0 0% −3.00
None 1 0 0% −1.00

SeasonRunsWinsSR£1
2024 3 0 0% −3.00
2023 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 ORSpdKTB Jockey SP
15 May 24+32d York Tattersalls Musidora Stakes (Fillies' Group 3) Class 1 · 10.5f · Good · 7 ran 5/7 3 9-2 8767A80A Ryan Moore 4/1
13 Apr 24+26d Dundalk (AW) Lucky Dip Has Landed At BetVictor Fillies Maiden 7f · Standard · 10 ran 2/10 1 9-3 —104A94A Ryan Moore 8/15F
18 Mar 24+230d Curragh Finlay Volvo Fillies Maiden 7f · Heavy · 18 ran 2/18 nk 9-1 —96C90A Ryan Moore 13/8F
01 Aug 23 Galway COLM QUINN BMW Irish EBF Fillies Maiden 7f · Soft · 8 ran 4/8 1 9-2 —64B76A Seamie Heffernan 9/2

Quick answers

How many races has Mayfair (IRE) won?
Mayfair (IRE) has yet to win, from 4 archived starts between 2023 and 2024. Placed 2 times in total (50% of starts).
Who trained Mayfair (IRE)?
Mayfair (IRE) was trained by A P O'Brien on the most recent run on record, at York on 15 May 2024.
Who is Mayfair (IRE)'s sire?
Mayfair (IRE) is by Justify (USA) out of Clemmie (IRE), whose sire is Galileo.
What is Mayfair (IRE)'s official rating?
The most recent official rating on record is 87, from the run on 15 May 2024. That is also the highest on record.
What is Mayfair (IRE)'s sire's record?
Justify (USA)'s progeny in our archive have won 17.8% of 523 runs since Jan 2008 (98 horses), Flat and jumps together. Strongest over 6f – 7f (all codes): 23.5% from 149. Weakest over 1m – 1m1f (all codes): 13.8% from 160.
Who are Mayfair (IRE)'s siblings?
Out of Clemmie (IRE), Mayfair (IRE) has 2 other produce in our archive, 2 of them winners. Most wins: Unless (USA) (2). Highest grade won: Listed (Unless (USA)). The wins came over 6f–1m2f. As at Oct 2026.

Record shown from August 2023. Our archive holds racing in Great Britain, Ireland and France from January 2005. Runs in other countries are not in it, and earlier runs are not available from our data provider. In-running comments are available from 2024 onward.