The 27-year-old was at the Alexandra Palace to take in the annual tournament and was seen on Sky Sports holding a sign saying: "Henry Glover give us a wave".
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THE BIGGER PICTURE
The England captain was treated to a dramatic night at the darts, as Rob Cross was knocked out by fifth seed Scott Williams, losing 3-1, while Dave Chisnall was also eliminated from the tournament.
DID YOU KNOW?
Williamson remains a pivotal player for the Gunners, playing seven times in the Women's Super League and a further five in the Champions League as the north London side aim to challenge for domestic and European honours this season.
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WHAT NEXT FOR WILLIAMSON?
With Arsenal on a break until January 12, Williamson will have plenty of time to take in the darts before the tournament ends early next year.