The Rolex Grand Slam of Eventing is the richest and most sought-after prize in the sport, and the world’s number one event rider, Britain’s Oliver Townend, has a fighting chance of becoming only the third person ever to capture it at Mars Badminton Horse Trials next week (9-12 May).

To win the $350,000 (£230,000) Rolex Grand Slam of Eventing, a rider must take first prize at the three most challenging CCI5* competitions across the globe – Defender Burghley Horse Trials (UK), the Defender Kentucky Three-Day Event (USA) and Mars Badminton Horse Trials (UK). They must be won consecutively, but in any order and on multiple horses.

Shropshire-based Oliver, 41, won Defender Burghley last autumn on Karyn Shuter, Val Ryan and Angela Hislop’s Ballaghmor Class, and last weekend he took Defender Kentucky on Paul and Diana Ridgeon’s Cooley Rosalent. Ballaghmor Class is Oliver’s ride at Mars Badminton – and the 17-year-old grey, who was part of Britain’s gold medal-winning team at the Tokyo Olympics in 2021, finished second at the Gloucestershire event in 2023.

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