Stephen Hendry (Sco) v Stephen Maguire (Sco)
Jamie Jones (Wales) v Ali Carter (Eng)
Ronnie O'Sullivan (Eng) v Neil Robertson (Aus)
Ryan Day (Wal) v Matthew Stevens (Wal)
All four quarters cue off today, still best of 25, first to 13, and scheduled to last 3 sessions. That could be in doubt with the first match, as Stephen Maguire thumped fellow scot Stephen Hendry 7-1 in the first session and needs 5 of the 8 evening frames to book Wednesday afternoon off.
The all welsh affair sees Ryan Day lead Matthew Stevens 5-3.
The Wales v England match is also 5-3 in favour of Englishman Ali Carter.
The remaining overseas player Neil Robertson leads fans favourite Ronnie O'Sullivan 5-3. Both players register exactly 100 as their highest break.
All four matches conclude tomorrow, on Day 12.