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William Muir & Chris Grassick

William Muir and Chris Grassick have built something genuinely impressive in a short space of time. The partnership only began in 2021, yet they have already racked up 106 career winners — a pace that suggests this is far more than two trainers simply sharing a yard. They are producing results at a level that takes most operations a decade to reach.Based on TrackLab's AI analysis
Quick Facts
Role
Trainer
Based
Lambourn, Berks
Record
21 wins from 192 races
Win rate
10.9%
Top jockey
Best course
Newbury (20% from 15 races)
Best going
Standard (all-weather)

📊 Key Numbers

A snapshot of this trainer's performance over the last 12 months
192
Races
21
Wins
10.9%
Win rate
avg ~10%
34.9%
Place rate (top 3)
avg ~30%

🔍 Full Analysis

TrackLab's AI-generated assessment based on career data and recent form
TrackLab's Trainer Breakdown
Auto-Generated

The headline achievement is hard to argue with: three top-level wins, two of them at Royal Ascot in consecutive summers. Ascot in June and July is the most competitive racing in Britain, the kind of stage where the best yards in the country show up with their finest horses. Winning there once is a landmark moment. Winning there in back-to-back years signals something more deliberate — that this team knows how to prepare a horse for the biggest occasion and get the result. The third Class 1 victory, at Lingfield Park in November 2021, came in only their first few months as a partnership, which tells you they hit the ground running from the very start.

The numbers this season tell a solid, workmanlike story. Twenty-one winners from 192 runners works out to roughly 1 in every 9 races — an 11% win rate that, across nearly 200 runners, means the yard is operating at a consistent, reliable level. Where things get more interesting is on normal ground, where the figures jump to 9 wins from 49 races, or roughly 1 in every 5. That is nearly double their overall average and worth noting if you ever see one of their horses declared on a dry, standard track. Newbury is another thread worth pulling: 3 winners from 15 runners at that particular track suggests a familiarity with the place that goes beyond coincidence.

Their go-to jockey is Lewis Edmunds, who has partnered their horses to 16 wins from 131 rides together — wins roughly 1 in every 8 times he climbs aboard for them. That kind of volume and consistency across more than 130 races speaks to a genuine working relationship, the sort where the communication between trainer and jockey is tight enough to make a real difference. Four years in, 106 winners, and two Ascot scalps already banked — Muir and Grassick are building something that looks like it has a long way still to run.

📈 Form Trend

How this trainer's win rate has changed month by month
Monthly win rate
2025–2026
11.1%
Apr
10.5%
May
10%
Jun
5.6%
Jul
16.7%
Aug
9.4%
Sep
13.8%
Oct
0%
Nov
7.7%
Dec
0%
Jan
50%
Feb
0%
Mar

🎯 Where This Trainer Thrives

Performance broken down by ground, class, and track type
🌧 Ground Conditions
Standard (all-weather)
Loves
Good (firm-ish)
Standard to slow
Ok
Soft (muddy)
Ok
Good to soft
Ok
Heavy (very wet)
Firm (dry)
Good to firm
Avoids
🏅 Competition Level
Class 1
Class 2
Class 3
Class 4
Ok
Class 5
Class 6
🏟 Track Shape
Wide and galloping
Loves
Left-handed, wide and galloping
Left-handed, tight turning
Right-handed, wide and galloping
Ok
Left-handed, tight
Right-handed, tight turning
Avoids
Left-handed, undulating
Avoids
Right-handed, undulating
Avoids

🏇 Jockey Partnerships

The riders they work with most, sorted by rides together
Lewis Edmunds First Choice
12.2%
Win rate
16/131
Won / Rode
5.6%
Win rate
1/18
Won / Rode
16.7%
Win rate
1/6
Won / Rode
Ryan Kavanagh
0%
Win rate
0/5
Won / Rode
0%
Win rate
0/3
Won / Rode
0%
Win rate
0/3
Won / Rode
0%
Win rate
0/3
Won / Rode
0%
Win rate
0/2
Won / Rode
0%
Win rate
0/2
Won / Rode
100%
Win rate
1/1
Won / Rode
100%
Win rate
1/1
Won / Rode
0%
Win rate
0/1
Won / Rode
Taryn Langley
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode
Jack Callan
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode
0%
Win rate
0/1
Won / Rode

Top Horses

The strongest horses currently associated with this trainer
Form: 2-3146
Form: 0
Form: 146193
Form: 13-341
Form: 256375
Form: 213822
Form: 142510
Form: 40-998
Form: 503434
Form: 8343-3

🏟 Course Record

Win rate at each course, sorted by number of races
CourseRacesWinsWin rate
Kempton Park 34 3 8.8%
Southwell 20 3 15%
Wolverhampton 19 2 10.5%
Newbury 15 3 20%
Ffos Las 14 2 14.3%
Windsor 14 0 0%
Ascot 10 1 10%
Lingfield Park 8 1 12.5%
chelmsford 6 2 33.3%
Chepstow 6 1 16.7%
Bath 6 0 0%
Newmarket 6 0 0%
Nottingham 5 1 20%
Leicester 5 0 0%
Sandown Park 5 0 0%
Newcastle 4 1 25%
Goodwood 3 0 0%
Salisbury 3 0 0%
Haydock Park 2 1 50%
Epsom Downs 2 0 0%
Doncaster 2 0 0%
Wetherby 1 0 0%
Brighton 1 0 0%
Chester 1 0 0%

📅 Recent Results

The last 20 results, most recent first
4 Mar
Southwell · 1m3f – 1m4f · Standard
3rd
28 Feb
Southwell · 1m1f – 1m2f · Standard
18 Feb
Kempton Park · 7f – 1m · Standard_To_Slow
12th
14 Feb
Lingfield Park · 1m1f – 1m2f · Standard
Won
11 Feb
Kempton Park · 1m3f – 1m4f · Standard_To_Slow
Won
30 Jan
Southwell · 1m6f – 2m · Standard
5th
28 Jan
Kempton Park · 1m1f – 1m2f · Standard_To_Slow
3rd
26 Jan
Wolverhampton · 1m1f – 1m2f · Standard
4th
19 Jan
Kempton Park · 1m3f – 1m4f · Standard_To_Slow
2nd
14 Jan
Kempton Park · 1m1f – 1m2f · Standard_To_Slow
3rd
13 Jan
Southwell · 1m6f – 2m · Standard
3rd
6 Jan
Southwell · 1m3f – 1m4f · Standard
3rd
30 Dec
Wolverhampton · 7f – 1m · Standard
6th
30 Dec
Wolverhampton · 1m6f – 2m · Standard
3rd
22 Dec
Wolverhampton · 1m1f – 1m2f · Standard
3rd
19 Dec
Southwell · 7f – 1m · Standard
10th
19 Dec
Southwell · 1m1f – 1m2f · Standard
5th
15 Dec
Wolverhampton · Long Distance (2m+) · Standard
10th
12 Dec
Southwell · 1m6f – 2m · Standard
Won
11 Dec
chelmsford · 1m3f – 1m4f · Standard
6th