Murphy opened the deciding frame with a red and a blue. He overcut an awkward red, and Wu made him pay with a 117 clearance. The frame was over.
Both their 2026 World Championship final and the Shenzhen Open quarter-final were settled in a deciding frame, with Wu beating Murphy on each occasion.
Murphy's lead gave way to a late escape
Murphy moved 3-2 ahead with breaks of 104, 98 and 68. Wu answered with runs of 94 and 121 to win the next two frames and go 4-3 ahead. BBC Sport also recorded those figures.
Wu then missed the match-ball brown in the eighth frame. Murphy cleared the table and forced a decider. His reprieve did not last.
Judd Trump reached the last four by beating Mark Selby 5-0 in the quarter-finals. The Shenzhen Open semi-finals were scheduled for Saturday, 3 October 2026.
The pair have now had another close match. Wu said the rivalry had raised the pressure on both players. Eurosport Nederland reported that he felt huge pressure in every match against Murphy because they both wanted to beat each other.