Nowacki trains with Tigers Jersey and is coached by Kieron Piper. He first gained international attention at the 2023 European Youth Summer Olympic Festival (EYOF) in Maribor, Slovenia, where he won silver in the 200 m breaststroke, before winning three medals at the 2023 Commonwealth Youth Games in Port-of-Spain, Trinidad.
In July 2025, Nowacki won gold in the 200 m breaststroke at the 2025 European Junior Swimming Championships in Šamorín, Slovakia, breaking the European junior record with a time of 2:08.32, before completing the double by winning the 100 m breaststroke. He won two further gold medals swimming the breaststroke leg in the medley and mixed medley relays.
On 20 August, he won the 100 m breaststroke in 59.20 seconds, breaking his own British age group record.[5]
On 22 August, he claimed gold in the 200 m breaststroke with a time of 2:07.32, setting a new Championship, British age group, and European junior record.
He defeated Japan's Shin Ohashi in both finals, who holds the World Junior Record in the 100 m breaststroke.[2]
Records
As of August 2025, Nowacki holds:
British age group record (17 years) – 100 m breaststroke: 59.20[5]
British age group record (17 years) – 200 m breaststroke: 2:07.32
European junior record – 200 m breaststroke: 2:07.32
Personal life
Born in Jersey, Channel Islands, Nowacki represents Great Britain in international competitions, and Jersey at the Island Games and the Commonwealth and Commonwealth Youth Games. He is known for his strong back-half splits and tactical race execution, particularly in the 200 m breaststroke.[citation needed]
Eight-time gold medalist - 2025 Island Games (50 m, 100m, & 200 m breaststroke, 50 m & 100 m butterfly, 100 m & 200 m individual medley, 4 × 100 m medley relay)
Silver medalist – 2023 EYOF (200 m breaststroke)[3]
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Great Britain 
