15.1 tight line, Zain props out... and feathers a nick to the keeper, Carter grabbing on the second attempt! Glamorgan lose their fourth 41/4

9.4 breakthrough! Karvelas gets one to climb on Byrom in the channel, takes the shoulder of the bat and Carter pouches it safely (having put down a tougher chance off the same bowler-batter combination earlier this morning) 24/1

10.1 Robinson pins Labuschagne lbw with his first ball to the Australian! Exuberant celebrations around the County Ground, Robinson knew that one was good - umpire Rob White didn't take long to deliberate, though Marnus lingered briefly, replaying the ball in his mind. Nipping in, maybe stayed low, looked pretty adjacent on replay 25/2

12.3 good length outside off, takes the edge - snaffled at third slip! Hudson-Prentice strikes with his third ball and Glamorgan are in a bit of strife here 31/3

20.3 bowled 'im, Carlson goes playing no shot! Robinson brings one back down the slope and clatters middle and off stumps to pick up his third wicket of the morning 65/6

19.3 angled in from round the wicket, Root lets it go... and the bails have been dislodged! Just clipped the top of off stump on the angle, I think. Haines has another and Glamorgan's morning gets worse 63/5

35.1 back of a length, slashed to slip! Karvelas breaks the ninth-wicket stand, with Smith pouching the catch safely 113/9

22.6 rapped on the pads, and given! A third for Robinson, and another pre-Ashes blow landed on the Aussies, as Michael Neser trails off for 2 69/7

26.4 Robinson bags a fourth! Back of a length, thick-edged into the slip cordon. Glamorgan in danger of being bowled out before lunch 79/8

37.4 tight line, draws the edge again - and Smith does the rest! Karvelas finishes with three and Glamorgan have been rolled for 123 123/9

12.3 bowled attempting to leave! McIlroy hits off stump, and Orr has to go. He's not the first batter to make such a misjudgment today, but he will be just as frustrated. Too close to let go, just coming back on the left-arm angle, and Glamorgan finally have a breakthrough 76/1

34.5 squared up and nicked to slip! McIlroy gets rid of Haines with one that seams and bounces, well held down low by Neser at first 131/4

13.1 full and straight, gone! Neser hits Alsop on the boot with a fiendish yorker and Glamorgan have two in as many overs. Looked a pretty easy decision for Rob White. Immediate success for Neser on the change of ends 81/2

15.6 speared into the front pad - given! Neser smuggled this past the inside edge, might have hit him on the back pad, and it looked pretty straight. Pujara goes for a duck, his first in the Championship for Sussex 83/3

74.6 gottim, Smith falls for 89! He didn't look happy with Martin Saggers' decision - hit on the back pad, might have been outside off - but he's on his way back. Glamorgan break the stand at 143. Smith's highest score for Sussex, but will he get to bat again? 274/5

107.3 fired in straight, Coles misses with a tired-looking drive and starts to walk even as the finger goes up! He gets an ovation as he heads off, been a mighty fine knock from the 19-year-old 410/7

91.6 edged... and taken! Labuschagne and Neser combine in the slips to give van der Gugten his first wicket. Labuschagne, at second, went with left hand and the ball popped up to Neser, who was alert to take the catch 331/6

115.2 skips down, goes for the lofted drive... and picks out mid-off! Hudson-Prentice has smashed it around with abandon but finally falls failing to clear the man 455/8

39.2 flighted, beats the attempted sweep, there's a flurry of activity behind the stumps and an appeal... given! Don't think Carter took it cleanly but he had the presence of mind to knock off the bails, and Zain is gone, stumped. Must have just dragged his foot out, and Martin Saggers at square leg was happy to grant the appeal 123/2

22.1 banged in, Byrom pulls... and it's plucked above his head by Carson at midwicket! Sussex finally break this opening stand, and it's Robinson once again, although not via his regular method of dismissal 91/1

104.1 gottim! Coles breaks this mammoth stand by skidding one into Labuschagne's pads from round the wicket. Big round of applause for Labuschagne as he walks off, having helped turn the game around for Glamorgan, who now lead by 53 with six wickets standing 411/4

39.3 struck on the pads, gone! Two in two for Carson. Northeast plays back to his first ball and is hit in front of middle and leg. Up goes Rob White's finger and after a quiet start Glamorgan are suddenly three down 123/3

134.6 driven firmly.. and held by Karvelas! Carlson falls short of a double-hundred, and Sussex have the big breakthrough on this fourth morning. Pitched up and inviting the shot, Carlson hit it well but straight at the bowler, who caught it smartly 510/6

150.6 chipped to midwicket! Haines bellows in celebration, as Cooke picks out the man in close. Not sure he was looking to bowl it there but it brings a much-needed wicket for Sussex 573/7

207.5 that's it, all over, red rover! Smith covers his face as Neser has a swipe at yorks himself. Two wickets for the Australian, in his final act for Sussex (we assume). Glamorgan have been bowled out for the fifth-highest second-innings score in the history of first-class cricket 737/9

187.1 Smith has taken a wicket with his offspin! Dragged down and slammed towards the deep midwicket rope by Harris, it almost cleared Sean Hunt, the substitute fielder, but he threw out a hand over his head and clung on, relaying the ball to himself as he crossed the rope and then returned inside of bounds. Sussex celebrate ecstatically, never mind the match situation. That was quite special 666/9