The venue was in shock as Webb began the brighter of the two players and took the opening set 11-8.
It prompted a response from Vai which her teammate could not deal with.
She levelled proceedings, winning the second set 11-1 and then claimed the third set.
That seemed to knock the wind out of Webb’s sails as her performance slowly began to deteriorate which the ruthless Vai took advantage of, winning the fourth set by the same margin as the second to ensure she topped the podium.