Three laps for Bottas before returning to the garage, although the day's dry window looks set to be a short one with the circuit to send out the water tankers during the imminent lunch break.
Meanwhile, Max Verstappen is now up to second behind Raikkonen with a lap of 1:23.920.
1 Raikkonen Ferrari 1m22.305s
2 Grosjean Haas 1m22.739s
3 Vandoorne McLaren 1m23.918s
4 Verstappen Red Bull 1m23.920s
5 Perez Force India 1m24.893s
6 Hulkenberg Renault 1m24.974s
7 Giovinazzi Sauber 1m25.037s
8 Bottas Mercedes 1m36.512s
Hamilton Mercedes No time
Massa Williams No time
Kvyat Toro Rosso No time
Sainz Toro Rosso No time
Palmer Renault No time
Morning session overall
After a hectic end to the session, the chequered flag drops!
Raikkonen ends the morning session fastest over Romain Grosjean and Stoffel Vandoorne.
Everyone is back in the pits, so no post-flag dramas like we had yesterday when Stroll ended up in the gravel.
Mercedes get up to eight laps before the chequered flag falls and the hour-long lunch break begins.
Kimi Raikkonen therefore ends up on top of the order for the wet-dry morning, his best lap a 1:22.305 - over two seconds slower than the searing pace we saw from Ferrari and Mercedes yesterday.
But, with the water tankers coming back out again, that might be as fast as it gets for Day Four.
The tankers are already on track ready to give us wet conditions again for the afternoon. Let's hope it's more successful than it proved this morning, but we're not holding out much hope.
So, the track was flooded during the lunchbreak, while the sun was beating down on it. So how long will it stay wet for this time - and how many teams will bother to actually go out?
Mercedes didn't do any wet running this morning due to an electrical fault, apparently, but this time it is first to venture out. Bottas is in the car, having got nine laps in before lunch when the plan to run Hamilton in the morning was abandoned.
Plenty of spray hanging in the air behind Bottas, and the combination of that and sunshine will delight photographers. So at least something half decent will come out of this second attempt at a wet test.
Three more laps on the board for Bottas - on full wets - and he comes back in.
The teams that did pull their weight this morning in the first wet running probably aren't that impressed that they are facing the same conditions again on the final afternoon of this week's track time. The urgency with which most cars went out when the track became fully dry in the morning suggested everyone was happy to see the back of the wet surface and keen to do some proper testing again.
Air temperature is 18 degrees, but it's very sunny and the track is at 35 degrees. That will dry out the track quicker than this morning.
Whilst everybody sits in the Pits apparently as we watch an empty track.
For the thousands of you wondering - and there will almost be as many wanting to know this as there are Sauber fans - the water being used to wet the circuit apparently comes from a well on a nearby pig farm. Apparently, it is non-drinkable.
What I would like to know is why has the track been wet again during the lunch break when the track temperature at 34C and only one car has gone out on it when it's drying all the time. It's just about the crazies thing I've seen in my life. Nobody seems to want to test in the wet, but they've ruined the chance of testing in the dry by doing this.
BOTTAS CONTINUES...
He's edging closer to his lap time from the morning session, but that's because he wasn't really pushing in the morning following a late arrival.
He's two seconds away from his current best.
BOTTAS HAS COMPANY!
Romain Grosjean and Antonio Giovinazzi are out on track.