There's an obvious tension out there. Johnson had a few words with Dilshan during that 24-run over. Umpire Ian Gould has also spoken to the batsman - and I don't think it was about what they're having for dinner. And Shane Watson eye-balled Dilshan after a semi collision in the last over. It's getting hot out there (to the tune of Nelly). Starc keeps it full - and tidy.

Image source, AP

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Australia captain Michael Clarke, spitting on his hands and tugging his collar up at slip, looks up for this one. However, his ambitions have gone from wicket-taking to run-prevention in the blink of an eye. A modicum of calm is restored by that over, which features six singles.

Russel Arnold
Ex-Sri Lanka all-rounder on BBC Test Match Special

"The way Australia are bowling at Sangakkara, he is struggling to find his rhythm. When the ball has been full he has not been able to move his feet He is right on the crease and that is why he is getting into all kinds of troubles and why he is not able to time the ball."

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Starc lands a much-needed blow for Australia, quite literally, pinning Sangakkara in the unmentionables with a short one that doesn't quite bounce as much as the batsman expected. A half-hearted appeal for an inside edge but Australia not convinced enough to review the not-out decision.

Eight of the last 12 balls have been boundaries. Make that nine from 13 as Sangakkara clears the off side once more. The change of ends hasn't done Mitchell Starc much good.

Australia turn to Shane Watson, who is 'Dilscooped' over fine-leg for four. Dilshan takes one on the helmet when he tries to repeat the trick, and Sangakarra gets in on the act with a flashing back-foot drive over point. Thrilling stuff.

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Jim Maxwell
BBC Test Match Special

"Dillers has got the thrillers - he's taking it on! Six sixes is showing off, but six fours is something else!"

Whoa whoa whoa! Now we're talking! Dilshan hits Johnson for six fours off the over.

Straight drive. Straight drive. Swat over mid-wicket. Pull behind square. Flashing cover drive. And a languid cover drive to finish. Anything you can do, Maxwell...

Right, Dilshan has had his sighter. He flicks Starc off his legs for a couple, but is fortunate to see a miscue pull land safely at backward square.

Vic Marks
Ex-England spinner on BBC Test Match Special

"The short ball has been a feature of this World Cup - we saw the South African batsmen yesterday against Pakistan getting out to the hook shot and the pull shot. It is a regular ploy if you have bowlers quick enough."

Image source, AP

I must admit I didn't expect Zimbabwe to get so close to beating Ireland on Saturday, in what would have been the highest successful chase in World Cup history. Set 332, they lost by five runs. Sri Lanka need 45 more than that, against a considerably better attack. Good luck, chaps. Johnson persists with the short stuff; Sangakkara pulls over square-leg - not entirely convincingly - for four.

Vic Marks
Ex-England spinner on BBC Test Match Special

"I haven't seen as much of Mitchell Starc as you guys have, but he seems to me to be bowling with the white ball as well as he ever has."

The Sri Lanka batsmen are having enough trouble getting the ball off the square at the moment, never mind thinking about meeting the required run rate. Starc is on the money. One off the over.

Walking to the crease with 372 needed is an unenviable situation for most batsmen, but there are few players you'd rather have there than Kumar Sangakkara. Johnson greets him with another short one that fizzes past his nose. Welcome.

Vic Marks
Ex-England spinner on BBC Test Match Special

"It was a short delivery and he didn't quite know whether to play it or leave it. He played it and it got big on him - he took the pace off it, maybe because it touched the glove. Good aggressive fast bowling from Johnson."

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Image source, Reuters

Mitchell Johnson strikes! The left-arm paceman needs just four balls to make his mark on this game, finding pace and bounce and, crucially, Thirimanne's glove as he fends at one. A diving Brad Haddin completes the job behind the stumps. Sri Lanka's task just got that little bit tougher.

The run rate is climbing already. Mitchell Starc limits Tillakaratne Dilshan and Lahiru Thirimanne to a single apiece. Two off the over.