Ronnie O'Sullivan had no problems against Kyren Wilson, and won his match with an unblemished 3-0 result as he won his four matches on Wednesday in the Championship League.
Ali Carter comfortably dispatched Barry Hawkins 3-1 earlier in the day, with O'Sullivan beating Joe Perry in another whitewash in his first match to maintain a perfect start to the day's action.
Carter then followed up to compound a miserable afternoon for Perry, as he won 3-2.
When is the English Open 2021? Dates, schedule, draw, odds
Welsh veteran Mark Williams defeated England's Mark Selby in Group 5 of the snooker Championship League on Wednesday.
- Trump hits back at critics after overtaking Hendry century record
- Trump storms past Selby to book place in Championship League Winners’ Group
- Day ends spell in the wilderness with win over Selby in Shoot Out final
Williams was able to secure a tight 3-2 win in the afternoon session. Wilson then added another defeat to Selby's afternoon with a 3-2 win.
Carter then faced off against O'Sullivan, and Carter had the honour of taking a frame off his opponent though still went down 3-1.
Williams continued his impressive evening when he made light work of Hawkins to win 3-1.
Carter got back to winning ways when he defeated Wilson 3-1, before Perry finally got a win when he beat Hawkins - without a win all night - 3-1.
Selby came up against O'Sullivan in one of the last games of the day and once again came off second best, as Ronnie cleaned up 3-1, before Wilson beat Williams 3-2 in the night's final match.
The results left O'Sullivan top of the group with four wins from for, ahead of Carter, Williams and Wilson in second, third and fourth respectively.
Mark Williams 3-2 Mark Selby
Ronnie O'Sullivan 3-0 Kyren Wilson
Ali Carter 3-1 Barry Hawkins
Ronnie O'Sullivan 3-0 Joe Perry
Ali Carter 3-2 Joe Perry
Kyren Wilson 3-2 Mark Selby
Ronnie O'Sullivan 3-1 Ali Carter
Mark Williams 3-1 Barry Hawkins
Ali Carter 3-1 Kyren Wilson
Joe Perry 3-1 Barry Hawkins
Ronnie O'Sullivan 3-1 Mark Selby
Kyren Wilson 3-2 Mark Williams
Northern Ireland Open
'Never seen a clearance as good as that' - O'Sullivan hails magic moment from Higgins
Northern Ireland Open
'Messi can maybe make the game look that easy' - O'Sullivan wowed by Higgins