Masalela is a native of
Maun, Botswana. At the
2022 African Championships he won his heat in the 800 metres in 1:48.69. He followed this up by winning the bronze medal in the final. In 2023, he lowered his 800 meters personal best to 1:45.24. At the
2023 World Athletics Championships in Budapest, he qualified for the finals of the
800m, placing 6th. In February 2024, Masalela set a national indoor record of 1:45.56 for the 800 metres in Metz. He ran at the
2024 World Indoors Athletics Championships in
Glasgow where he reached the semi-finals. In April 2024 he came third in the 800 meters during the
2024 Diamond League Xiamen meeting and set a new PB of 1:43.88. He finished fourth in the 800 meters at the
2024 Meeting International Mohammed VI d'Athlétisme in May and third at the
2024 BAUHAUS-galan Diamond League event in Stockholm. On 12 April 2025, he finished runner up over 800m to
Kethobogile Haingura on the World Athletics Continental tour in
Gaborone. In May 2025, he won the 800 metres race at the
2025 Doha Diamond League, running an early world leading time of 1:43.11. The following week, he lowered his early world leading time to win the
2025 Meeting International Mohammed VI d'Athlétisme de Rabat ahead of
Max Burgin and
Emmanuel Wanyonyi. He placed fifth over 800 metres at the
Diamond League Final in Zurich on 28 August. Masalela was a finalist at the
2025 World Athletics Championships in
Tokyo, Japan, in September 2025 in the
men's 800 metres, running 1:42.77 in the final, the first 800m race in history in which all eight competitors ran under 1:43. However, Masalela was later disqualified giving Habz the victory, having been adjudged to have made an unsportsmanlike gesture as he crossed the finishing line.{{Cite web | url= https://worldathletics.org/competitions/world-athletics-indoor-tour/news/torun-world-indoor-tour-final-2026-charlton-crestan-dosso |title= Charlton, Crestan and Dosso close World Indoor Tour Gold in style in Toruń == References ==