Michael Emons
BBC Sport at York Barbican

What a win for Barry Hawkins, beating Ronne O'Sullivan for only the third time in what was their 21st meeting.

O'Sullivan made two breaks of more than 100 in the opening four, but Hawkins went on a run of more than 290 unanswered points to fight back from 4-2 down and cause a huge shock on day one, afternoon one.

No-one in the press room saw this one coming. What a way to start the tournament.

Michael Emons
BBC Sport at York Barbican

What a chance for Barry Hawkins. The table is open and inviting. Ronnie O'Sullivan can only sit, wait and hope.

Can Hawkins hold his nerve and seal a memorable win?

Michael Emons
BBC Sport at York Barbican

Day one, afternoon one and we could be seeing a big shock straight up.

Barry Hawkins has only won two of his 20 matches with Ronnie O'Sullivan, but is now one frame away from dumping the reigning champion out.

Hawkins has now scored than 260 points without reply. O'Sullivan on the brink and currently being frozen out. Who saw this coming?

Michael Emons
BBC Sport at York Barbican

Fightbacks on both tables.

Shaun Murphy was in complete control at 3-0 ahead, including a black-ball finish in the opener, but China's Zhao Xintong has fought back well with three frames in a row.

Two of those three have also been on the black ball and we're now level at 3-3 in a race to six.

On table one, Ronnie O'Sullivan has been 3-1 and 4-2 ahead, but Barry Hawkins is battling hard. A break of 73 saw him grab the seventh frame, followed by a run of 75 to leave it at 4-4 and in effect a best-of-three match.

Michael Emons
BBC Sport at York Barbican

We're a couple of hours into this year's tournament and two enthralling matches are ongoing.

On table one, Ronnie O'Sullivan has looked like he would sweep away Barry Hawkins, who only scored one point in three of the opening four frames - although he did win the other one.

But a break of 60 from Hawkins in frame five saw him keep O'Sullivan in touch, only for the defending champion to clinch the sixth frame.

Signs of frustration from the top seed when he punched the table after missing a red into the middle, with Hawkins then compiling a break of 73 - his best of the match - to pull it back to one.

O'Sullivan still only needs two more, but he's not having it all his own way.

Progress isn't as quick on table two, but Murphy, who led 3-0 but then lost the next two against China's Zhao Xintong, has a slight lead.

Barry Hawkins needed to win that fifth frame and gets the job done, winning it 106-0 thanks to breaks of 46 and 60.

William Callaghan: Ronnie definitely affects Barry, no question about it, hard to see him turning around this deficit especially with his poor record.

Remember, you can watch the action by pressing the 'watch live' tab at the top and we're back in action in the Ronnie O'Sullivan v Barry Hawkins match.

Hawkins, after failing to register a point in two frames and only get one in another frame, is in first after the restart and gets to 46, but has to play safe on a red, sending the cue ball back to baulk.

Shaun Murphy was in a strong position to move 4-0 ahead and led 32-23 in frame four, only to leave the blue hanging over the pocket and Zhao Xintong did the rest with a break of 50 to reduce the deficit to 3-1.

A break of 76 in frame three helps Shaun Murphy to a 3-0 lead and halfway to the last 16.

Ronnie O'Sullivan is definitely in the mood today. Check out his long pot success. Flawless, 100%.

Barry Hawkins has scored 81 points so far, none in frames one and three, one in frame four with the other 80 all coming in frame two.

We're already at the mid-session interval on table one with the Rocket Ronnie O'Sullivan blasting through and leaving with a 3-1 advantage.

It's the second century clearance of the match from him as he follows up his 128 in frame one, with a break of 114 in frame four.

Over on table two, Shaun Murphy recovered to snatch the opener on the black and then hits a break of 98 to double his lead. He looked on course for a century, but a long missed red rattles around the jaws and stays on the cloth.

Barry McCann: Barry Hawkins plays a really decent break off shot and he's one down after five minutes.

No messing about from eight-time champion Ronnie O'Sullivan as he regains his lead against Barry Hawkins.

He made a break of 42 at the start of frame three and then wraps up the frame a bit later on.

Remember, all matches except the final are the best of 11, so the first to six.

Shaun Murphy was 63-19 behind against Zhao Xintong, but stole it on the black, winning the opener 74-69.

Murphy's looking fired up and responds with a little fist pump after sinking the frame-winning ball.

We've got some match going on involving Ronnie O'Sullivan and Barry Hawkins. After O'Sullivan's 128 clearance, Hawkins hits a break of 57 on his way to making it 1-1.

But on the other table we're still in the first frame, Zhao led 63-19, Murphy got it back to 63-49 before missing a yellow with the rest. It's now 69-52, with four balls left on the table.

A strong response from Barry Hawkins as he gets in on table one and makes a half-century, with him still at the table looking to make it 1-1.

On table two, Zhao holds a 63-19 point lead in the opener, with three reds still on the table.

Superb from Ronnie O'Sullivan as he makes a 128 clearance to instantly stamp his mark on the match.

What a way to start for Ronnie O'Sullivan as he rattles in the opening century of the tournament.