Former world number one Deta Hedman was another surprise first-round loser at the BDO World Championship.
After second seed Lisa Ashton's defeat on Saturday, three-time finalist and third seed Hedman, 59, lost 2-0 to Maria O'Brien at the Lakeside.
In the men's event, two-time former champion Scott Waites saw off Belgian debutant Jeffrey van Egdom 3-1.
Poland's Krzysztof Kciuk beat fellow debutant Brian Lokken 3-1, a win which included a checkout of 160.
Fallon Sherrock, the 24-year-old from Buckinghamshire who was runner-up to Ashton in the 2015 World Championship and won last year's World Darts Trophy, beat 2017 runner-up Corrine Hammond 2-0 and will face O'Brien in round two.
In the final match of the evening between two Welsh veterans, Wayne Warren, 56, beat 61-year-old national team captain Mark Layton 3-0 with an average of 98, the highest of the tournament to date.