Barcelona F1 test two day four
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Sirotkin's improvement came on soft tyres while Hartley is running on the supersofts.
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Hartley improves to a 1m20.234s in fifth place as Sirotkin also finds time with a 1m20.661s.
Stopwatch
Raikkonen improves to a 1m18.292s. There were no further fastest times after the first sector.
Raikkonen's out there on supersofts again and just set the best first sector so far.
No improvement from Sirotkin, whose quite a lot slower in the end. Ocon, on softs, was also on a personal best lap, finishes it but doesn't improve.
Sirotkin is on a personal best lap at the moment.
Sainz only managed four laps before that problem and is yet to set a time.
Crash
While Alonso and Leclerc are out of action for obvious reasons, Sainz's Renault has also been absent for a while now. The team is investigating a gearbox problem.
Ocon and Raikkonen join Sirotkin on track.
For the full array of pictures from today - and the rest of testing, and all of motorsport always - keep checking back to motorsport.com's gallery section: 
Air temperature up to 13.8C, track temperature at 33.9C. Prime for some running – and Williams agrees as it sends out Sirotkin.
Sirotkin chasing Hartley
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All cars in the garage now. The track is silent.
Autosport
We've seen Pirelli's new hypersoft appear plenty of times in testing, now there's news of its first confirmed grand prix appearance - though by a quirk of F1 its first appearance to be announced is likely to be its second actual appearance: 
Ricciardo improves to a 1m20.275s.
Grosjean's pit now, but Ricciardo won't be on track solo for long – smoke in the pitlane heralds the imminent arrival of a Ferrari.
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Majority of the runners back in the pits now, only Grosjean and Ricciardo still on track.
Race control reminds us that there's no lunchtime stoppage. Thanks. Rub it in.
Or rather, down to a 1m19.952s in fourth. He was already fourth. Fourth.
Grosjean up to fourth on a 1m19.952s.
Mercedes taking on Ferrari in a supersoft battle this morning
Karun Chandhok
I'm watching trackside at Turn 3. Ricciardo is able to use a tighter line turning into the long right-hander. The car has an impressive front end to stay flat from that tighter angle, allowing him to carry more speed out of Turn 2.
A worse final sector, though, leaves Raikkonen a few hundredths shy of his best.
Raikkonen backed off on his last lap and is pushing hard now...Two best sectors so far.
Ocon improves again in third on a 1m19.691s. Ricciardo's down to a 1m20.358s now, in fifth.
Stopwatch
Raikkonen goes to the top with a 1m18.298s on supersoft tyres.
And Raikkonen's fastest in the middle sector too...
Fastest first sector of anyone so far from Raikkonen on this lap.
Sirotkin finds some time and sets a 1m20.750s. He's sixth-fastest in the Williams.
Ricciardo's improved to a 1m19.686s now, and is into fifth, while Ocon gets into the 1m19s and Hartley the 1m20s.
Playing it cool on mediums so far - Ricciardo and Red Bull into fifth now
White smoke. Hello Kimi. What an odd but familiar theme of testing.
Hamilton posts another best middle sector but the lap is a few tenths slower overall.
Back to green-flag running, photographers back in business
Ocon also makes a modest gain on that lap, but can't quite break into the 1m19s. He's third still on a 1m20.017s.
Stopwatch
Hamilton improves slightly to a 1m19.464s.
Hamilton sets the fastest middle sector of anyone so far.
By: Geoff Creighton
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