2015 was Bruintjies's breakthrough year. On 8 June, he won the 100 m ahead of fellow South African Anaso Jobodwana at the Josef Odložil Memorial in Prague, running 10.06 (+1.5 m/s); the time was his personal best and a South African sea-level record. A month later, he ran 9.97 (+0.8 m/s) at near-altitude in La Chaux-de-Fonds, breaking Magakwe's South African record of 9.98; he was the third South African (after Magakwe and Simbine) to break 10 seconds in the 100 metres. Simbine equalled Bruintjies's record at the Universiade only four days later.