Pieter Sisk

Pieter Sisk (born 8 December 1999) is a Belgian middle-distance runner, who specializes in the 800 metres.

Career

2024 Sisk qualified for the 800 meters at the 2024 Summer Olympics with his time of 1:44.46, which he ran in Brussels on 25 May 2024. At the Olympics, he failed to qualify for the semi-finals after finishing 6th in the heats and 3rd in the repechages.

2026 In January 2026, Sisk met the qualifying time for the 2026 World Athletics Indoor Championships in Toruń, Poland at the CMCM Indoor Meeting in Luxembourg, ran a European record over the unusual distance of 2000 metres at the New Balance Indoor Grand Prix 2026 in Boston, Massachusetts, and set a Belgian indoor record for the mile that was faster even than the Belgian outdoor record for that distance at the time. In March, he was eliminated in round 1 of the 2026 World Athletics Indoor Championships in Toruń, Poland and in August he suffered the same fate in round 1 of the 2026 European Athletics Championships in Birmingham, England.

Personal bests 800 meters – 1:43.48 (Lausanne 2024) 800 metres indoor – 1:46.10 (Apeldoorn 2024) 1000 metres – 2:15.29 (Oordegem 2025) 1000 metres indoor – 2:17.17 (Ghent 2024) 1500 meters – 3:31.85 (Paris 2025) 1500 metres indoor – 3:33.32+ (Boston 2026)

1 mile – 3:50.31 (Boston 2025) 1 mile indoor – 3:50.31 (Boston 2025)

2000 meters indoor – 4:52.41 (Boston 2025) ABP,

3000 meters – 7:51.07 (Herentals 2023)