Marc Brian Louis

Early life and education Louis' father, Gilbert, first realised that Louis had running potential when he took the then eight-year-old Louis to a run at Sembawang Park. Louis dabbled in football and swimming growing up, but eventually gravitated towards track and field. He successfully defended his title the following year, adding a gold in the 400 m hurdles as well. In the same tournament, he clocked 13.74s in the 110 m hurdles to set a new national U-18 record. Earlier in the year, Louis had won the 400 m hurdles and came in second in the 110m hurdles at the 2019 Southeast Asian Youth Athletics Championships. In the same year, he broke the national U-20 record for the 100 m with a time of 10.39s – 0.02s off the men's record. Because of his performances, he was granted deferment from National Service. This paid off at the 2021 Southeast Asian Games, where he won a bronze in the 100m and was also part of the men's quartet that won a bronze in the 4x100m relay — Singapore's first relay medal at the competition in seven years.

At the 2023 Southeast Asian Games in Phnom Penh, Louis won another bronze in the 4 x 100 m relay and a silver in the 100 m, matching his personal best of 10.39s in the latter. At the 2022 Asian Games in Hangzhou, China, Louis finished 6th in his 100 m semi-final and 13th overall. However, he broke the 22-year national record set by UK Shyam in 2001 (10.37s) with a time of 10.27s. At the 2024 World Athletics Indoor Championships, he broke another national record, this time at the 60m (6.69s).

On 11 August 2025, Louis broke Reuben Rainer Lee's 200 m record of 21.07s with a time of 20.89s at the Sano Sprint Meet in Japan, becoming the first Singaporean to clock a sub-21 for the event. In the 100 m, he finished fourth (10.32s).

Personal bests 60 m – 6.68s (2026 World Athletics Indoor Championships) 100 m – 10.27s (+2.0 m/s, Hangzhou 2022) 200 m – 20.72s (Bangkok 2025)