Brown has a strong indoor season in 2014. He ran bests of 5.84 seconds for the 50 metres, 6.62 seconds for the 60 m, then ran a world-leading time of 20.59 seconds. His indoor time of 33.30 seconds for the 300 metres was also a world lead, and a 400 metres run of 46.24 seconds mark yet another best for the athlete. He was chosen as the heat runner for the Jamaican 4×400 metres relay team at the 2014 IAAF World Indoor Championships and, after he qualified the team, they won the bronze medal in the final. In April and May, Brown set outdoor personal records of 20.29 seconds and 46.64 seconds for 200 m and 400 m distance. Given his form, he was again called up to the national team: at the 2014 IAAF World Relays he was the third leg runner in the 4×200 metres relay. The team in the heats (Rasheed Dwyer, Brown, Livermore, and Warren Weir) set an area record time of 1:20.15 minutes. Brown and Weir were joined by Nickel Ashmeade and Yohan Blake in the final, where they broke the world record for the event, taking the gold medal in 1:18.63 minutes. This improved upon the 20-year-old mark set by the Santa Monica Track Club.