Sun found an early hold on the match winning the first two games before Wang surged back to even matters at 2-2. The fifth game was a battle of attrition as the two pushed each other to 10-10.
Wang had an opportunity to swing the match in her favor going a game point up at 10-9 but could not convert. Instead, Sun scored two consecutive points to regain her lead at 3-2.
The defending champion looked well on her way to securing her second consecutive singles title as she opened a near-unassailable 10-6.
Wang then launched a stunning fightback effort, saving four championship points before winning the game to send the contest into the decider.
The tenacious resurgence gave Wang boost in confidence as she started the seventh game in fighting form taking a 2-0 lead.
Sun turned the tables, scoring six points on the trot to finally hold off the resilient Wang before falling to the ground in celebration.
