[1] Mason was a silver medalist at the 2014 World Junior Championships in Athletics in the 110 metres hurdles in Eugene, Oregon.

His time of 13.05 seconds beat the Jamaican national junior record of Omar McLeod set the previous year.

[2] In 2016, Mason won the bronze medal at the 2016 NACAC U23 Championships in Athletics in the 110 m hurdles, running 13.67 seconds to finish fourth on the day, later upgraded to a bronze medal after Puerto Rican race winner Will Barnes was disqualified due to a antidoping rules violation.

[3][4] In July 2023, Mason finished fourth at the Jamaican Athletics Championships in Kingston in the 110 metres hurdles in 13.22 seconds.

[8] In February 2024, he ran a new personal best 60m hurdles time of 7.65 seconds as he finished runner-up to compatriot Rasheed Broadbell in Fayetteville, Arkansas.