Max Verstappen LED Team Mate Sergio Perez in the Red Bull One-two on Saturday in the Formula One Wet Formula training session for the Belgian Grand Prix.
The Dutch, who also set a step on practice on Friday before turning to obstacles, getting rid of corrugated tracks, seven-km spa-francorchamps in one minute 56.924 seconds, almost faster than Perez Mexico.
Mercedes Lewis Hamilton’s rival title is the third.
Verstappen came to the weekend which was determined to revive the challenge of his title with a victory of the girl at the spa after seeing the advantage of 33 points over Hamilton turned into an eight-point deficit in two races.
Briton Hamilton, the winner four times around the wooded track, was shooting for the 100th victory with landmarks on Sunday.
After rowing but most of the day was dry on Friday, the weather changed the spa gave rain threatened on Saturday.
Drivers use intermediary tires on the moist track with some taking into the runoff area when they have to hold with slippery conditions.
The trajectory seemed to be dried when the session developed but the rain returned with a little under half an hour to leave before broke in the end.
More rain in front of qualifications can change the position of the battle for the lottery later on Saturday.
Behind the big three, Lando Norris went to the fastest fourth for McLaren.
France Esteban Ocon, who ran to Maiden Formula One win in the last race in Hungary, is the fifth for Alpine.
Lance Stroll, brought a five-place grid penalty to collide with Charles Leclerc at the beginning of a race in Hungary, was sixth for Aston Martin in front of Alphaturi Pierre Gasly.
Sebastian Vettel, a winner three times at the spa, is eighth in the other Aston Martin in front of Williams of Briton George Russell and Fernando Alonso who complements the top 10 for Alpine.
Valtteri Bottas, celebrates its 32nd birthday, only 11 in Mercedes.
Finn also brought a five-place grid penalty to trigger an initial accident in Hungary.
Leclerc, runs a new chassis after crashing on Friday, is 16 for Ferrari.
Kimi Raikkonen was pitted at the beginning of the session with the brake failure at Alfa Romeo.