Early in the season, with wins over the likes of Jimmy White, Li Hang and Mark Allen, Walden reached the quarter final of the Riga Masters but lost to the eventual champion Neil Robertson 4–2. In December 2018, Walden suffered a shock first round exit in the UK Championship after losing 6–5 to Jak Jones. He failed to qualify for the World Snooker Championship after losing 10–9 to Eden Sharav in the qualifying round, despite leading 9–6.