That's it for the day, folks; the rain has passed, but enough water has fallen on the covers for the umpires to deem it would take too long to clear them and get things started again.
5.40: It may be another 20 minutes or so before the decision is made, but the skies are dark enough to suggest that we may have seen the last of the action this evening...
England 0-0 (1.3 overs): England survive nine balls before the gloom and the rain mean that the umpires offer them the option to go off...which they obviously accept. We could still be back on this evening if things clear up.
The England run-chase begins under gloomy skies at The Oval...
South Africa 318ao (99.2 overs) ALL OVER! BROAD WRAPS IT UP! Collingwood takes another fine low catch in the slips as Ntini edges a Broad leg-cutter! England will chase 197 for victory...
South Africa 313-9 (96.4 overs): AND ANOTHER! DE VILLIERS PAYS THE PRICE! Desperate to get his ton, de Villiers comes down the track to Monty and looks to go over the top...but his swipe misses the ball and he is bowled for 97! Tough luck, and England are just one wicket from closing up this innings! The crowd have come to life!
South Africa 313-8 (95.4 overs): BREAKTHROUGH! FINALLY! England have the wicket they have been pressing for! Finally an edge from Harris goes to hand as Broad pitches full just outside off...Flintoff takes the catch! Relief for England! Nel comes to the crease, with AB on 97 not out...
South Africa 308-7 (95 overs): de Villiers is approaching his century; 96 not out. It would be his second of the series after his 174 at Headingley in the second match...
South Africa 305-7 (92 overs): After weathering a bit of a storm, South Africa are just beginning to press on now; the lead is up to 185. Harris is fortunate to get away with a leading edge that flies just out of reach of cover.
South Africa 288-7 (90 overs): This is fantastic batting from Harris and de Villiers; they have had to contend with some fairly hostile bowling from Flintoff, but haven't shirked the challenge.
South Africa 273-7 (87 overs): de Villiers is doing a good job of protecting Harris by taking the majority of the strike, although England's line to him with this new ball hasn't been that clever; he has been able to leave far too much.
The evening session is underway...
South Africa 265-7 (85 overs) TEA: South Africa make it through to tea without further loss. England will be getting a bit frustrated here.
South Africa 260-7 (84 overs): South Africa lead by 138 as the clouds gather overhead. They will be thinking that if they get a lead of 230+, they will still have a chance of winning this match by bowling England out tomorrow. It's going to be a really interesting two or three sessions coming up...
South Africa 251-7 (81 overs): England have taken the new ball. Harmison and Anderson are the men KP has turned to, but they just can't get at Harris enough to build any great pressure on him.
South Africa 233-7 (78 overs): Flintoff peppers Harris with some short stuff, striking him on the helmet with one as he attempts to force him onto the back foot before sliding in a yorker. Harris is a tough cricketer.
South Africa 228-7 (75 overs): The lead is up to 106 as England strive to polish off the South Africans. Harris finds himself surrounded by close-in fielders as Panesar runs in. de Villiers has passed his half-century; it's been an attacking knock, he's trying to take the fight to England now.
South Africa 218-7 (73.4 overs): PANESAR GETS ONE! After several loud, lingering, highly-annoying appeals, Panesar gets the nod from Umpire Dar; a flighted ball spins and takes the glove, Bell diving in with a smart catch at short-leg.
South Africa 217-6 (72 overs): England fancy their chances with Panesar against Morkel, the spinner targetting the rough outside off-stump. The tailender copes well, though; trying to get his foot outside off and sweep with the spin.
South Africa 208-6 (70 overs): Panesar has a couple of decent LBW shouts turned down; he seems miffed about it. Morkel is the new batsman the hulking bowler is a reasonable left-hander with the bat and won't make it easy for England.
South Africa 201-6 (68.1 overs): BREAKTHROUGH! ANDERSON STRIKES TO REMOVE BOUCHER! The England seamer gets one to jump a little off a length, the ball takes the shoulder of Boucher's bat and loops to gully for a simple catch! England are into the tail...
South Africa 200-5 (67 overs): The skipper has brought himself into the attack for a bit of rare-seen off-spin. He immediately gets some turn to AB, but nothing too dramatic. Spin from both ends as Monty continues; perhaps Pietersen is trying to speed up the arrival of the new ball.
South Africa 190-5 (64 overs): No sniff of a breakthrough in the afternoon session for England as South Africa extend their lead to 69 runs. Panesar is brought into the attack for just his fifth over of the innings. England have 16 overs to wait until the new ball.
South Africa 186-5 (62 overs): Pietersen has consistently turned to Harmison when he wants wickets; he has shown a lot of faith in the big fast bowler this Test, and it has been rewarded.
South Africa 170-5 (59 overs): The skies have gotten a little gloomy; we might have a shower on the way. Broad has one of those bat-pad LBW appeals turned down; impossible to tell whether that was pad first or not.
South Africa 170-5 (57 overs): This is a big wicket for England; they know if they can break this partnership, then it exposes a fairly long tail for South Africa. Broad is handed a chance by KP, and the youngster starts the afternoon session with a good maiden outside off-stump.
The afternoon session is underway...
South Africa 168-5 (55 overs) LUNCH: England's morning, without a doubt. Harmison put in the hard yards early on with a longish spell that earned him two wickets, and Flintoff kept the pressure on by adding the scalp of Prince. The lead is 46 runs, and England will be scenting victory here.
South Africa 163-5 (53 overs) Boucher is the new batsman; Monty has a decent LBW shout rejected against de Villiers; bat and pad together on that one.
South Africa 161-5 (51.2 overs): WICKET! RASH SHOT FROM PRINCE! Flintoff makes it three wickets for England this morning, although it needed a rash flash from Prince outside his off-stump, Strauss taking a high catch at first slip! Fine morning for England.
South Africa 157-4 (50 overs): England are trying to tempt AB de Villiers into a hook; Flintoff is banging the ball in short, with only one man out on the hook, but for the moment the batsman is resisting the shot. Panesar comes into the attack for the first time today, and for only his second over of the innings.
South Africa 151-4 (48 overs): South Africa's lead is up to 29 with half-an-hour before lunch. Panesar looks like he is itching to get into the attack, but for the moment Pietersen is sticking with his seamers as Broad and Flintoff continue...
South Africa 148-4 (45 overs): de Villiers takes one on the grill from Flintoff, who has come into the attack to replace Harmison, who has created some pressure with his fine spell this morning. KP is still on the attack with his field placings; three slips waiting to snap up any edge...
South Africa 138-4 (42 overs): Harmison has sent down eight overs in his spell this morning and has done superbly. Anderson has been replaced at the other end by Broad, who is getting some swing back into the left-hander Prince from around the wicket.
South Africa 138-4 (40 overs): DRAMA! The very next ball after Pietersen had put down Kallis with a dolly in the covers, Collingwood takes a low catch in the slips to remove the key batsman! Harmison has a second wicket of the morning, and England are definitely on top now... The skipper is so relieved!
South Africa 133-3 (38 overs): Harmison is testing Prince out with plenty of short stuff, with two men waiting for anything poorly defended - but the little left-hander is doing a fine job of keeping his shots down.
South Africa 122-3 (36 overs): Kallis and Prince's stout defence suggests South Africa will be happy to settle for a draw in this match. Harmison almost sneaks a yorker through Kallis' defence, but the master batsman jabs his bat down in time.
South Africa 121-3 (34 overs): South Africa were taking about winning this match at the start of the day; they might just begin to think that batting out for a draw would be a more sensible option. Pietersen is setting some interesting fields to Prince; he has Bell in at backwards short-leg.
South Africa 120-3 (32 overs): Prince is the new batsman as South Africa find themselves three wickets down and still trailing England by two runs. Kallis has been short of runs this series; South Africa could do with him making some today, that's for certain.
South Africa 119-3 (29.3 overs): FINE CATCH, AMBROSE! Amla edges Harmison, Ambrose takes a fine low catch, diving in front of first slip. He looks so relieved to have clung on to that! England make an early breakthrough and are right in the hunt again...
South Africa 115-2 (29 overs): Broad is handed just the one ball before Pietersen turns to Anderson to keep the pressure on South Africa at the start of the day.
South Africa 114-2 (28 overs): Kallis edges for four off the first ball of Harmison's over, but the big quickie responds well, surprising the batsman with a couple of short balls before nipping one back just above off-stump.
South Africa 110-2 (27 overs): Off we go! Amla flashes and misses at the first ball of the morning as Broad finishes off his over.
10.38: Meanwhile, England coach Peter Moores has revealed that wicketkeeper Tim Ambrose suffered a suspected broken finger late on Friday. "It's nasty but as all true keepers do, he got stuck in and he's carrying on but it's quite painful. It might be broken, we don't know but in some ways there's not much point in doing much about it now because the game's on so it's one of those where we'll assess it at the end of the game."
10.29: Both sides are optimistic that they still have the time and desire to win this match; South Africa coach Mickey Arthur is looking for his team to get a second innings total of around 350, which would give them a good lead to defend: "We feel we can defend 220, and if we can get that high there will be a lot of pressure on the England top five. From a South African point of view we certainly don't want to lose any Test matches. We would be really gutted to lose the last Test match here."
10.12: Hi friends; welcome to the fourth day of the fourth Test. Skies are bright over south London; we should be set for a prompt start, a bonus after yesterday's downpour.