We'll be back with qualifying in a couple of hours - join us again then.
Free Practice 3
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Hamilton can't respond and the final practice session ends with Button on top, followed by McLaren team-mate Button, Webber, Alonso and Massa.
There's the flag but Button continues to depose Hamilton at the top of the timesheets with a new best of 1m36.910s.
With all cars on the track now it doesn't look like there'll be any improvements to times at the top.
Vettel gets stuck in traffic again - and again it's Alguersuari in the way, just like the last lap.
It's between Hamilton and Button at the moment as the Red Bull of Vettel gets stuck in traffic and is forced to abandon his flying lap.
Massa, on supersofts, goes fifth with an effort of 1m38.434s.
Hamilton improves firther with a lap of 1m37.199s lap.
Button goes close to Hamilton's benchmark with a 1m37.696s.
Button, Vettel, Webber and Alonso are back out on the softs. Hamilton too.
So, with 10 minutes left, we're braced for a late session blitz on soft tyres...
Vettel's absence from the top of the timesheets might be explained by a vibration he was feeling in his Red Bull. Apparently, that was due to the German flat-spotting his front right tyre, but with those tyres now finished, we can expect the world champion to set some quicker times.
Just the unfortunate Ricciardo still to set a time during this session.
Hamilton responds to his team-mate with a 1m37.595s on his soft compound tyres. And the Briton is back in the lead.
Button now edges past Hamilton at the top of the timesheets with a 1m38.005s - that's now the time to beat with just over 20 minutes remaining.
Button jumps back ahead of the two Ferraris before Hamilton improves his benchmark time to 1m38.020s.
Alonso into third with a 1m39.317s... Red Bull's Vettel and Webber have slipped to eighth and 13th respectively.
Senna and Rosberg have a near miss as the latter exits the pit lane...
Ricciardo's problem was to do with leaking radiator fluid.
Hamilton tells McLaren: "The track feels like it is being quite kind on the tyres."
After a rather hectic opening 20 minutes, the track has quietened down a little now as teams peruse the data collected.
So, Hamilton leads, and the Briton looks comfortable out there.
Massa breaks up that McLaren one-two with a time of 1m39.293s, the Ferrari man going into second place.
Ricciardo's got a problem here as he pulls up short of the HRT garage. Mechanics are forced to push him home.
Button makes it a McLaren one-two with a time of 1m39.507s.
Hamilton now puts in the fastest time of the day with a lap of 1m38.210s - that's some distance better than the rest.
It's getting grey again as clouds sweep over the track.
Senna spins in his Renault but he's soon back under way.
Hamilton goes third fastest with a lap of 1m39.830s.
Webber and Vettel are both now back in the Red Bull garage as Button prepares to set a time for the first time today.
So, as things stand it's Vettel leading Webber, Schumacher and Rosberg. Hamilton yet to post a time.
Webber soon blazes over the line quickest before Vettel trumps his team-mate with a time of 1m39.799s after 10 minutes of the session.
Schumacher, who was quickest in yesterday's first practice session in the wet, is next to take over at the top with a time of 1m40.471s.
Rosberg briefly deposes Webber as frontrunner but the Aussie is soon back at the top after clocking a lap of 1m40.754s.
Webber responds to his Red Bull team-mates's effort with a 1m41.919s to go top of the timesheets.
Vettel is the first to clock a time today - a 1m43.575s to set the early benchmark.
Most cars are going with soft tyres for their opening laps. Vettel, Webber, Button and Alonso are among those out there.
Pleny of early action out there today as a host of cars get out onto the track. Nearly half of the field are out on their installation laps.
Here we go then! The final practice session is under way in Korea!
That said, the entrance to the pit lane is still a touch wet... watch out for that.
Just to confirm those improved weather conditions, here's Team Lotus on Twitter: "Saturday weather update - no rain until 1300, then less than 20% chance until 1700. Air temp up to 22, track temp up to 31 and light winds."
So today should give the teams a chance to see how their cars fare in the dry on soft and super-soft tyres.
Yesterday's first two practice sessions were blighted by the rain, but today's affair should be altogether different with the sun out this morning.
Hello and welcome to our coverage of the third and final free practice session ahead of Sunday's Korean GP at Yeongam.