Cross was sat on double 18 for the victory which is known as one of the former World Champion's strongest doubles and he pinned it to add to his title haul.
Smith was on 110 to claw another break back which could have turned the tide again in the match and the joy was on Cross's face for all to see.
Watch the moment he hit the winning double below:
https://twitter.com/OfficialPDC/status/1155567177610625024