SlPl · CZE
Ondrej is a swimmer from Czechia, a butterfly specialist and an international traveller on the circuit, whose official competitive record spans 11 seasons, 24 countries and 111 meets.
His recorded career begins in 2016, and one of his earliest marks still on file is the 1500 freestyle in 15:09.35, raced in Plzen. He started out alongside Plavecký klub Slávia VŠ Plzeň z.s..
His signature event is the 200 butterfly, the event he has raced the most, followed by the 400 freestyle and 100 butterfly. Butterfly is the backbone of the whole record: 100 meets and 150 recorded swims.
His fastest 200 butterfly stands at 1:49.78, set in long course (50 m).
His record includes world championships, between 2021 and 2024 (15th FINA World Swimming Championships (25m) 2021 and 16th FINA World Swimming Championships (25m) 2022). A representative mark at that level is 1:58.34 in the 200 butterfly, recorded in long course (50 m). He also appears in the World Cup circuit, continental championships, national championships and international meets.
The record runs unbroken from 2016 to 2026: 11 consecutive seasons without a single missing year. 2019 is the busiest season on record, with 60 verified individual swims.
He is a genuinely international swimmer: the official record spans 24 countries (Czechia, Hungary, France, the United Kingdom, the Netherlands, Spain, Germany, Slovakia, Israel, Italy, Monaco, the United States, Australia, Austria, Belgium, China, Poland, Romania, RUS, SLO, Serbia, Sweden, the United Arab Emirates and Canada), including 50 of 111 meets outside Czechia.
Those meets span 50 different venues (Pardubice, Plzen, Prague and Brno…). He has raced for SlPl.
Still active: the directory includes official activity in the 2026 season. The last race on record is dated September 6, 2026 in Znojmo, with 1 swim: 24.90 in the 50 butterfly, all in short course (25 m). He holds 33 current event personal bests and 99 all-time PB improvements across 291 verified official swims in competitions governed by World Aquatics.