Paul Burton: Day has missed so many easy balls in these two sessions. O'Sullivan isn't really having to work too hard to win these frames because they're being gift wrapped for him.

My 12-year-old son's just come up with an alternative acronym for Ronnie O'Sullivan.

The FISH - Finest In Snooker History.

He's clearly nicked it from somewhere - but as an alternative to the oft-parroted GOAT, I quite like it, you know.

Shaun Murphy
2005 world champion on BBC Two

Ryan Day went for that yellow, a shot he'd expect to get.

But it's one of those ones where you know, if you miss it, you're leaving the table for your opponent.

And when your opponent is the best of all time, you're bang under pressure. Having missed it, he'd expect to lose the frame - and he did.

Yep, a 82 clearance earns Ronnie O'Sullivan the opening frame of the evening.

John Parrott
1991 world champion on BBC Two

He does make it look ridiculously simple, the cue ball has been on an absolute string in this break, right from the opening red.

It's never been in doubt.

As you'd expect, the seven-time world champion is making the task of mopping up these remaining reds look quite straightforward.

Stephen Hendry
Seven-time world champion on BBC Two

That's been the story of the match so far - when Ryan Day has had a big shot, and he knows it's a big shot, he's not potted them.

It wasn't an easy shot, but it wasn't too difficult.

Ryan Day cursing his luck.

Ronnie O'Sullivan goes in off and Day crunches in a long red - but lands right on top of another red, making an otherwise unmissable blue tricky and not a great option position wise.

He goes for a mid-distance yellow instead - but it rattles in the jaws.

Image source, BBC Sport

Ryan Day misses a tricky-ish blue on 21 but Ronnie O'Sullivan is quickly back in his seat after jawing a black after his opening red.

Early miss to the middle pocket by the 'Rocket'.

And Ryan Day capitalises with a wonderful cut into the corner on a red, with the cue ball dead on the cushion.

Exactly the start 'Dynamite' will have wanted.

BBC Two

You can watch the first hour of the second session of Ronnie O'Sullivan's last-16 clash with Ryan Day on BBC Two - then from 20:00 BST, coverage will switch to BBC Four.

The resumption of Kyren Wilson's meeting with Joe O'Connor, meanwhile is available on the Red Button and iPlayer.

You can choose between both matches on those devices - as you can right here on the BBC Sport website by clicking the 'Watch & Listen' tab at the top of the page.

Image source, PA Media

Joe O'Connor beat four-time champion Mark Selby in one of the shocks of round one at the Crucible.

But the Leicester potter fell 6-2 behind against 12th seed and former World Championship finalist Kyren Wilson in the first session of their last-16 tie on Saturday.

Wilson, who lost to Ronnie O'Sullivan in the 2020 final, impressed with breaks of 50, 105, 71 and 78, to take a four-frame advantage into tonight's second session.

Michael Emons
BBC Sport at the Crucible Theatre

Image source, Getty Images

Seven-time world champion Ronnie O'Sullivan made a strong start to his last-16 match against Wales' Ryan Day and holds a 5-3 advantage heading into tonight's second session.

The 48-year-old Englishman is on course for an eighth Crucible title, which would move him clear of Stephen Hendry's mark of seven successes.

Day is aiming to get into the World Championship quarter-finals for a fourth time, after losing in that round in 2008, 2009 and 2012.

O'Sullivan, who thrashed 22-year-old Welsh qualifier Jackson Page 10-1 in the first round, made breaks of 123 and 84 in the opening two frames, although world number 18 Day took the next two frames.

Breaks of 83 and 51 helped O'Sullivan go 4-2 in front, Day responded with a break of 115, but O'Sullivan restored his two-frame advantage with a 92 in the last frame of the session.

Read the full report here.

Scotland's Stephen Maguire moved into the quarter-final thanks to a 13-9 victory over 2005 world champion Shaun Murphy.

A fired-up Maguire had built a 10-6 lead on Saturday.

Breaks of 68 and 73 from Maguire helped him win two of the opening three frames on Sunday to move one away from victory.

Murphy, the eighth seed, took the next two, but Maguire made a superb break of 127 to seal victory.

It means 11 of the 16 seeds have been eliminated in the opening two rounds.

Image source, Getty Images

Two quarter-finals set.

Two more to be decided.

Image source, BBC Sport

The career century count keeps nudging up one by one, including another this morning against Ryan Day.

The big question, though, is will the second number in the graphic below will be inching up by one a week on Monday?

Ronnie O'Sullivan four matches away from moving ahead of Stephen Hendry in all-time Crucible titles by claiming what would be a record-breaking eighth World Championship.

Image source, BBC Sport

Michael Emons
BBC Sport at the Crucible Theatre

Image source, Michael Emons

Ronnie O'Sullivan is aiming to become the most successful player in Crucible history a week on Monday as he aims for a record-breaking eighth title to move clear of Stephen Hendry's seven successes.

The 2001, 2004, 2008, 2012, 2013, 2020 and 2022 champion has already been in stunning form this week, winning his first-round match 10-1 against Welsh qualifier Jackson Page.

Another Welsh player in Ryan Day, 18th in the world, is up against him tonight for the second session of their last-16 tie, with O'Sullivan holding a 5-3 lead.

If the Rocket blasts off out of the blocks, he could even move to the quarter-finals tonight, but would need to win all eight frames in this session.

Kyren Wilson also resumes and he is in charge at 6-2 against Joe O'Connor, who will be looking to replicate his first-round form that saw him defeat four-time champion Mark Selby.

Thirteen is the winning target.

Image source, Michael Emons

Image source, BBC Sport

Second round (best of 25, seedings in brackets)

19:00

(12) Kyren Wilson 6-2 Joe O'Connor

(2) Ronnie O'Sullivan 5-3 Ryan Day

Live coverage

19:00-20:00 - BBC Two

20:00-22:00 - BBC Four

Highlights

00:00-00:50 - BBC Two (not available in Northern Ireland)

00:50-02:50 - World Championship Extra - BBC Two (starts 01:25 in Northern Ireland)

Michael Emons
BBC Sport at the Crucible Theatre

Both matches finish close to each other, and both have 9-7 showing on the scoreboards.

Stuart Bingham has the edge over Jack Lisowski, taking the last frame on the pink ball to ensure he has the lead going into Monday's final session.

On the other table, Mark Allen has the advantage over John Higgins after recovering from 7-5 down to win four frames on the bounce, with breaks of 71, 94, 80 and 74.

Bingham and Allen both need to win four frames tomorrow, Lisowski and Higgins need six.

Michael Emons
BBC Sport at the Crucible Theatre

Two very-hard fought, quality matches in action at the moment. Over on table one, four-time champion John Higgins leads two-time semi-finalist Mark Allen 7-5

It was 4-4 after yesterday's first session, before Higgins' break of 75 in the ninth frame was followed by Allen's effort of 54 to make it 5-5.

Higgins took the next two for a 7-5 advantage.

On the other table, in a match between two unseeded players, it is 7-7 in the clash between Jack Lisowski and 2015 champion Stuart Bingham.

Thirteen is the winning target in both matches, with both coming to a conclusion on Monday evening.