Walden's best result of the season came in the English Open, he reached the quarter final after winning against players like Michael Holt and Thepchaiya Un-Nooh before dispatched by David Gilbert in the decider. At the UK Championship, he was knocked out in the second round by Martin O'Donnell, losing 6–2. In July 2020, he was unable to qualify for the World Snooker Championship for the consecutive year after losing 10–5 to Matthew Stevens in the final qualifying round.