John Higgins showed glimpses of brilliance as he ended Fergal O'Brien's UK Championship in Milton Keynes in the first round.
Three-time winner Higgins produced a break of 123 in the fifth frame of his comfortable 6-1 victory against the Irishman and made four other scores of over 50.
Higgins was rarely in trouble and moved into a 3-0 lead and although the O'Brien took the fourth frame, he failed to register another point in the final three.
2012 and 2016 UK champion Mark Selby beat Michael White 6-4 and made the highest break on the opening day of the tournament with a 140 clearance in frame three.
World number four Selby led 3-2 and 5-3 and sealed his passage with a break of 75 in the 10th frame after White had reduced the deficit to 5-4.
"That was class all the way from the start!" @markjesterselby clears the table with a 1??4??0?? break ??— Eurosport UK (@Eurosport_UK) November 23, 2020
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Barry Hawkins made half-century breaks in five frames as he strolled to a 6-1 win against Riley Parsons.
Two-time winner Mark Williams cruised through to the second round by white-washing Ben Hancorn 6-0 and former world champion Graeme Dott was untroubled in his 6-1 defeat of China's Zhao Jianbo.
Jianbo's countrymen Pang Junxu, Yan Bingtao and Li Hang all progressed to the second round.
Pang upset world number 28 Tom Ford 6-4, Yan beat Sean Maddocks by the same score, with the help of a 130-break in frame two, and Li's 6-3 win against Fraser Patrick included breaks of 134 and 101.
David Grace, who reached the semi-finals of last week's Northern Ireland Open, beat Ian Burns 6-4 and Chinese teenager Chang Bingyu produced a break of 136 in his 6-4 defeat of Sam Craigie.
Germany's world number 111 Simon Lichtenburg was a surprise 6-3 winner against Scott Donaldson, 86 places higher in the rankings, and Jamie Clark squeezed past Martin O'Donnell 6-5.
Limerick native Leo Fernandez takes on Ronnie O'Sullivan on Wednesday when Jordan Brown will also face Martin Gould.
Former World champion Ken Doherty, Mark Allen and Aaron Hill are all in action on Thursday, against Lu Ning, Jamie Wilson and Kurt Maflin respectively.
Earlier in the day, Anthony Hamilton and Ryan Day tested positive for coronavirus and withdrew from the tournament.
The pair were due to face Xu Si and Jak Jones respectively and they received walkovers into round two.
Hamilton, who suffers from asthma, controversially withdrew from the World Championship at the Crucible in July citing fears over plans to admit a limited number of spectators.
But he has played in subsequent tournaments, including losing in the first round of last week's Northern Ireland Open at the same venue.