With action paused at the Crucible until Monday evening, there's plenty hanging on the final session, with tournament favourite Neil Robertson needing an inspired comeback if he is to progress past the second round.
The 40-year-old Australian trails 9-7 to England's Jack Lisowski after the 30-year-old put on an impressive display on Sunday afternoon.
The pair were hard to split early on, with the match tied at 4-4 before Lisowski managed breaks of 119, 122, 137 and 74 to race ahead. Robertson kept in contention with 69 but needs to improve is he is to claim the win in the final Monday evening session.
The 2019 world champion Judd Trump was also in action over Sunday, and he faired better than Robertson despite not playing his best snooker.
The 32-year-old was up against Scotland's Anthony McGill in the second round and heads into Monday with a 10-6 advantage after showing glimpses of brilliance.
High breaks of 79 and 52 helped him stamp authority on the match, leaving little work to be done on Monday to book his spot in the next round.
Despite not being at his best, Trump was praised by seven-time world champion Stephen Hendry, who complimented him for getting the job done even when not playing well.
"The average frame time has been around 23 to 24 minutes so for a normal operating Judd Trump you would think that is wrong.
"To get a 10-6 lead against someone like Anthony McGill not at your best, that is a good performance."
Monday's session will also bring more excitement through the match between 2015 champion Stuart Bingham and Kyren Wilson, who are locked at 8-8 after Sunday's play.
After reaching the final in 2020, Wilson looked in top form again, and narrowly missed out on a maximum 147 after potting 12 reds and 12 blacks.