He made his debut in the CAF Champions League in January 2012 against Matlama FC, and in the PSL was four months later against Free State Stars.

[6] He won the African Football League with Mamelodi Sundowns in 2023 where he made two important penalties saves one against Al Ahly and the other one against CA Petróleos Luanda.

Williams made his first appearance for South Africa on 5 March 2014, in a friendly against Brazil, due to a sprained ankle suffered by the first-choice keeper, Itumeleng Khune.

[9] On 3 February 2024, in South Africa's 2023 AFCON quarter-final match against Cape Verde, the game was drawn at 0–0 after extra time.

[10] Although South Africa lost to Nigeria in the semi-finals in another penalty shootout, Williams went ahead to win the Best Goalkeeper of the tournament.