Red Bull's Formula One leader Max Verstappen completed a British Grand Prix practice double at Silverstone on Friday with Ferrari close and Williams' Alex Albon looking surprisingly quick.
Verstappen led team mate Sergio Perez one-two in the opening session and was again fastest in the late afternoon when last year's winner Carlos Sainz was second on the timesheets for Ferrari.
Albon was an eye-catching third in both sessions for a team currently ninth out of 10, with American rookie team mate Logan Sargeant also fifth in practice two.
Dutch double world champion Verstappen produced a best time of one minute 28.078 in practice two after lapping in 1:28.600 in the first. Sainz was just 0.022 slower.
Perez, Verstappen's closest title rival but a hefty 81 points behind after nine races, was 0.448 slower in session one and 0.264 down in the later one when the Mexican finished fourth.
Verstappen has won seven races this season and is chasing a sixth in a row for the first time in his career.
Red Bull have won every race and, when last year's final is added to the tally, are chasing an 11th win in a row to equal the 1988 McLaren record set by Ayrton Senna and Alain Prost.
Aston Martin's Fernando Alonso was fourth and 10th respectively, with Ferrari's Charles Leclerc fifth in the opening one.
The Monegasque did not set a time later on as Ferrari worked to fix an electrical issue on his car.
Mercedes made a slow start to the weekend, with seven-times world champion Lewis Hamilton only 12th and team mate George Russell 14th in practice one, when they were the only ones not to use the soft tyres.
Russell was 12th and Hamilton, winner of his home race a record eight times, was 15th.
Mercedes have a front wing upgrade but Hamilton reported bouncing halfway through the session while Russell said his car was "all over the place" at turns six and seven.
McLaren's Lando Norris was eighth and 14th fastest with Australian team mate Oscar Piastri 10th and ninth. Both had the latest upgrades on their cars after just Norris in Austria, where he finished fourth.
