Defending champion John Spencer lost to Perrie Mans in the first round of the 1978 championship. The 1977 runner-up Cliff Thorburn was defeated 12–13 in his quarter-final match against Eddie Charlton, who won the last five frames. However, Charlton then lost to Ray Reardon in the semi-finals; he was ahead 12–9 after the first three sessions of the match, but Reardon won all seven frames of the fourth session to win 18–14. Mans met sixty-four-year-old Fred Davis in the other semi-final, defeating him 18–16. Reardon won the final 25–18 to claim his sixth world title. He became the oldest World Champion, aged . The first seven World Snooker Champions all won a championship when in their forties; the last of these was Reardon. It would be another forty years before a quadragenarian won the title again, as Mark Williams won the 2018 championship aged forty-three.