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The latest withdrawal has raised fears that several big matches could end as walkovers with five days of action left. Three-time champion Michael van Gerwen hit out at the event's organisers.
But Boris Johnson says "we can't rule out any further measures after Christmas" as Omicron spreads fast.
Covid: No new restrictions in England before Christmas - Boris Johnson
Covid cases appear to have peaked in Gauteng province, health authorities say
Sir Jeremy Farrar said the new variant is doubling every two days and it is not yet known if that rate is levelling off.