Dave Chisnall has withdrawn from the William Hill World Darts Championship after testing positive for Covid-19 ahead of his match with Luke Humphries.
Humphries will receive a bye to the last 16 and Wednesday afternoon's session will continue with two matches.
Jose de Sousa will play Alan Soutar, and Nathan Aspinall then plays Callan Rydz.
The tournament is being broadcast live on Sky Sports in the UK, through the PDC's worldwide broadcast partners including DAZN and RTL7, and on PDCTV (excluding UK and Netherlands based subscribers).
2021/22 William Hill World Darts Championship
Wednesday December 29
Afternoon Session (1230 GMT)
3x Third Round
Jose De Sousa v Alan Soutar (R3)
Luke Humphries Bye (Dave Chisnall withdrawn) (R3)
Nathan Aspinall v Callan Rydz (R3)
Evening Session (1900 GMT)
1x Third Round, 2x Fourth Round
Gary Anderson v Ian White (R3)
Gerwyn Price v Dirk van Duijvenbode (R4)
Jonny Clayton v Michael Smith (R4)