Postpublished at 02:29 GMT 23 March 2018
Brendon Hartley has sneaked back onto the track after a lengthy spell in the garage to gather some data in the final couple of minutes. He's currently 18th quickest.
Image source, Getty ImagesSummary
Hamilton fastest in second practice, but top teams appear close
Rain expected across qualifying and the race
Bottas, Ocon & Alonso all go off track
Postpublished at 02:29 GMT 23 March 2018
Image source, Getty ImagesMove along...published at 02:24 GMT 23 March 2018
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End of X postPostpublished at 02:24 GMT 23 March 2018
Jolyon Palmer
Former Renault driverWhat's happening on the Ferrari and probably most cars now is a small, little tweak. All this now is data gathering and maybe a long run, we've seen Bottas on that.
Get involved #bbcf1published at 02:23 GMT 23 March 2018
Aileen McKee: Suddenly baby Evie’s 2am feeding doesn’t seem so hard! Got #bbcf1, external and P1 commentary to keep me company (and awake!). Let’s see Red Bull pull a win out of the bag this weekend!
Postpublished at 02:22 GMT 23 March 2018
Into the final 10 minutes of the session. Mercedes leading the way but Ferrari haven't yet sampled the ulrasofts.
Latest timespublished at 02:21 GMT 23 March 2018
Image source, F1.comPostpublished at 02:20 GMT 23 March 2018
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End of X postPostpublished at 02:18 GMT 23 March 2018
Kimi Raikkonen, on softs, is up to fourth after a 1:24.875, within eighth tenths of a second of Lewis Hamilton's benchmark time.
Fernando Alonso is making up for lost time. He's up to eighth after clocking 1:25.896.
Image source, Getty ImagesPostpublished at 02:16 GMT 23 March 2018
Kevin Magnussen locks up and goes wide, skipping over the grass before returning to the circuit. Magnussen currently has the 16th quickest time (1:27.035).
Image source, Getty ImagesPostpublished at 02:15 GMT 23 March 2018
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End of X postPostpublished at 02:15 GMT 23 March 2018
Toro Rosso were looking good in testing but we haven't seen much of them today.
Pierre Gasly has the ninth quickest time (1:26.294) while Brendon Hartley, not on the track at the moment, is down in 18th (1:28.308)
Image source, Getty ImagesPostpublished at 02:12 GMT 23 March 2018
Meanwhile, Fernando Alonso's first run sees him up to 14th with a 1:26.638. Solid.
Postpublished at 02:11 GMT 23 March 2018
And it is an improvement for Lewis Hamilton as a 1:24.026 increases the gap between himself and Valtteri Bottas to half a second.
Image source, Getty ImagesLatest timespublished at 02:10 GMT 23 March 2018
Stoffel Vandoorne is up and running with a 1:29.558. Fernando Alonso is starting his first timed lap now as Lewis Hamilton looks to be on the way to going even quicker.
Image source, F1.comPostpublished at 02:08 GMT 23 March 2018
Looks like Fernando Alonso is ready to rock and roll now. He's strapped in his McLaren, a little shake of the head is a brief cause for concern but there's no drama as he rolls on out of the garage with 22 minutes left on the clock.
Image source, Getty ImagesAlonso updatepublished at 02:06 GMT 23 March 2018
Andrew Benson
BBC Sport’s chief F1 writer in MelbourneMcLaren say: We had an exhaust issue on Fernando's car but he should be going out again soon
Perez flyingpublished at 02:05 GMT 23 March 2018
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End of X postGet involved #bbcf1published at 02:04 GMT 23 March 2018
Bwoah Racing: Start of last season, I was optimistic and looking forward to the races despite Kimi's poor form. This season, even an upturn in Kimi's fortunes would struggle to cure what feels like a severe hangover- an insight into dark future for #F1, external
Postpublished at 02:04 GMT 23 March 2018
Lewis Hamilton is on new ultrasofts, by the way.
Hamilton goes even quickerpublished at 02:03 GMT 23 March 2018
"A lot of traffic," reports Lewis Hamilton but it doesn't stop him from lowering the benchmark with a 1:24.147, increasing his advantage over Valtteri Bottas to four tenths of a second.
Image source, Getty Images