John Higgins beat Ronnie O'Sullivan 6-3 in the quarter-finals of the Masters.
John Higgins also advanced as he beat Jak Jones.
The world number 66 produced a thrilling display of attacking snooker.
Indoor sporting events in tier one and two locations are conceivably able to host a maximum of 1,000 fans under Covid-19 regulations.
O’Sullivan chalked up three half-century breaks and a clearance of 121 in a near faultless display at the Marshall Arena.
Stuart Bingham also compiled the second maximum break in as many days in the sixth frame of his first-round win over Zak Surety.
Kyren Wilson had a break of 147 on Tuesday.
The Englishman follows in the footsteps of Judd Trump, who made a maximum en route to winning the Northern Ireland Open last week.
All of the results for players involved on tables three to six came back negative
John Higgins also wins on opening day at Milton Keynes.