It seems the soft tyre is the one to be on as Stroll is faster than Verstappen at the front of the field.
He comes in for new soft tyres. He rejoins in 15th.
The rain is easing according to Sky Sports' Ted Kravitz from the pit lane.
Verstappen is running around five seconds slower than earlier in the race.
"I almost lost it!" Replays show him having some oversteer at Eau Rouge.
"It's raining quite a lot."
A bit more rain is falling but not enough to come in for intermediates.
Let's see how it develops and if any of the teams respond.
Verstappen, Perez, Leclerc, Hamilton, Alonso, Russell, Gasly, Stroll, Tsunoda and Ocon.
"Raining Turn 15."
"Rain in four minutes."
Verstappen takes the lead of the Belgian Grand Prix!
He's now in DRS range of Perez at the front.
Incredible pace from the Dutchman.
Verstappen comes in for fresh rubber.
He rejoins behind his teammate. The gap is 2.2s between the two Red Bulls.
Perez comes in for medium tyres, as does Leclerc.
Both are in on the mediums.
Hamilton is the first driver to pit from the lead pack for fresh mediums.
Alonso gets past Hulkenberg for P8 at Les Combes.
A lot of track action currently with tyres suffering from degradation.
Good pace from Perez - he's resisting Verstappen currently with the gap remaining around 2.7s.
Perez, Verstappen, Leclerc, Hamilton, Alonso, Stroll, Russell, Gasly, Hulkenberg and Albon.
Verstappen breezes past Leclerc into second - he has a 2.7s gap to make up on Perez.
Magnussen goes fastest in the Haas, 1s clear of Perez on the last lap.
Sainz is now down to 10th in his damaged Ferrari.
Verstappen is through on Hamilton with the use of DRS into Les Combes.
Up to third now for the Red Bull driver.
Perez, Leclerc, Hamilton, Verstappen, Alonso, Tsunoda, Sainz, Albon, Stroll and Russell.
Norris has dropped to 11th after losing two positions on the last lap.
Alonso breezes past Sainz into Les Combes for fifth.
Sainz is currently running with damage following contact with Piastri on Lap 1.
Perez has a 2.2s lead over Leclerc at the front.
Leclerc has Hamilton and Verstappen in DRS range.