One Master

One Master did not race as a two-year-old, making her racecourse debut on 19 August 2017 when she finished third in a maiden race over six furlongs at Doncaster Racecourse, beaten one and a half lengths by the winner Equitation. In September she was ridden by Ryan Moore when she started the 4/11 favourite for a similar event at Yarmouth Racecourse and recorded her first success as she took the lead a furlong from the finish and pulled away from her seven opponents to win by two and three quarter lengths.[5] Martin Harley took the ride when the filly was stepped up to Listed class for the seven-furlong October Stakes at Ascot Racecourse on 7 October and started a 20/1 outsider in a thirteen-runner field. After being restrained at the rear of the field One Master began to make progress in the last quarter mile, overtook the front-running favourite Eternally a furlong out, and kept on well to win by one and a quarter lengths from Bletchley.[6]

On her first start of 2018 One Master finished fourth after starting favourite for the Group 3 Chartwell Fillies' Stakes over seven furlongs at Lingfield Park on 12 May. In the following month she was sent to Ireland for the Ballyogan Stakes at the Curragh but was again the beaten favourite, taking third place behind Actress and Gorane. On 3 August at Goodwood Racecourse she was beaten again as she finished fourth behind the three-year-old Pretty Baby in the Oak Tree Stakes. At the end of the month the filly returned to Ireland for the Fairy Bridge Stakes over seven and a half furlongs at Tipperary Racecourse and started the 9/2 second favourite behind the Aidan O'Brien-trained I Can Fly. Ridden by Colm O'Donoghue she recorded her first win of the year as she produced a strong late run to take the lead in the closing stages and won by half a length from Dan's Dream.[7] After the race O'Donoghue said "I spoke to James Doyle and Ryan Moore and they were very complimentary of the filly. They said to ride her cold as she’d finish off the race good and ground and trip wasn’t a problem. She hit the line strong".[8]

On 7 October One Master was ridden by Pierre-Charles Boudot when she started a 33/1 outsider for the Group 1 Prix de la Forêt over 1400 metres at Longchamp Racecourse. The Prix Maurice de Gheest winner Polydream started favourite, while the other thirteen runners included Teppal, Gustav Klimt (Superlative Stakes), Sir Dancealot (Lennox Stakes), Inns of Court (Prix du Gros Chêne) and James Garfield (Mill Reef Stakes). After being restrained towards the rear of the field, One Master produced a sustained run on the outside in the last 400 metres and caught the leader Inns of Court on the line to win by a short head, with Dutch Connection a head away in third.[9] After the race William Haggas said "Pierre-Charles had to get her settled, which he did beautifully, and she picked up well. She's a lovely filly that wants soft ground... She's tough... Her owners have been fantastic... They send me everything they breed, and I'm absolutely thrilled. I trained this filly's mother and grandmother".[10]

One Master had two more races in 2018. In November she was sent to the United States to contest the Breeders' Cup Mile at Churchill Downs and finished fifth to Expert Eye, a length behind the winner after staying on well in the closing stages. In December she ended her campaign in the Hong Kong Mile at Sha Tin Racecourse, coming home eighth of the fourteen runners behind Beauty Generation.

One Master began her 2019 campaign by running fourth behind Beshaayir in the Lanwades Stud Stakes at the Curragh on 25 May. Starting a 20/1 outsider for the Queen Anne Stakes at Royal Ascot in June she took the lead a furlong out but was overtaken in the closing stages and came home third behind Lord Glitters and Beat The Bank. In the Falmouth Stakes at Newmarket Racecourse on 12 July she produced a sustained run from the rear of the field but failed by a neck to overhaul the Michael Stoute-trained four-year-old Veracious.[11] She was dropped back in distance for the Prix Maurice de Gheest over 1300 metres at Deauville Racecourse in August and came home fifth behind the three-year-old Advertise.

On 6 October One Master attempted to repeat her 2018 victory in the Prix de la Forêt and started the 3.4/1 second choice in the betting behind the five-year-old City Light, the winner of the Prix de Saint-Georges and the Prix du Pin. The other contenders included Sir Dancealot, Glorious Journey (Hungerford Stakes), Safe Journey (John of Gaunt Stakes), Waldpfad (Hackwood Stakes) and Hey Gaman (Prix du Palais-Royal). Ridden by Boudot, she settled towards the rear of the twelve runner field before edging left to the outside to make her challenge in the straight. She gained the advantage entering the last 200 metres and held off the sustained challenge of City Light to win by half a length with the pair finishing three and a half lengths clear of Speak In Colours in third place.[12] Haggas commented "She's been a fantastic filly who runs well every time. She's lightly raced because there are very few races she can run in. She may stay in training. The owners keep telling me they're too old to breed horses so would like the fun... She has a particular trip. This is the only Group 1 over seven furlongs, and she's managed to win it twice. She needs softer ground, so she will go to Ascot for the British Champions Sprint Stakes in two weeks' time, and that will be it for the season".[13]

As Haggas predicted, One Master ended her season in the British Champions Sprint Stakes on 19 October and started the 4/1 joint-favourite alongside Advertise. She produced a sustained late run after being denied a clear run approaching the final furlong but failed by a length to overhaul the 33/1 outsider Donjuan Triumphant.[14]