More than four years after a near-fatal brain injury in a skiing accident, Michael Schumacher is still being cared for at home in the quiet Swiss town of Gland on the shores of Lake Geneva.
Defending champion Lewis Hamilton was less than a tenth of a second behind Ricciardo with the slightly slower ultrasoft tyres on his Mercedes, followed by Ferrari driver Sebastian Vettel.
Vettel had the fastest time in the morning session with a lap of 1 minute, 20.396 seconds, two tenths faster than Valtteri Bottas of Mercedes.
Cold weather also affected the first two days of testing, keeping teams from learning much about the new 2018 cars as the track remained without enough grip for proper runs.
The Finn's lap of 1 minute, 20.270 seconds was followed by Stoffel Vandoorne in his McLaren and Sebastian Vettel, who was getting his first drive behind the new Ferrari.
Team's development driver Nikita Mazepin will run the car first in Monday's testing while drivers Sergio Perez and Esteban Ocon will take turns to test the new car later in the week.
Speaking at the launch of Mercedes' new W09 car at Silverstone, Hamilton said that he had already made it clear to his current Formula One team that he is not considering any other options outside Mercedes.
Williams Martini Racing revealed the first look of its 2018 Formula One challenger car, the Williams Mercedes FW41, at the team's season launch in London.
Bottas said 'grid girls' have been a part of the motorsport for quite a long time now, and the idea of introducing children in the F1 would be a great idea for the sport.
Raikkonen currently sits fifth in the driver's standings heading into this weekend's season-ending Abu Dhabi Grand Prix.
Massa announced his retirement before the Brazil race in 2016, but was eventually invited back to F1. This time he says his decision to leave is final.
The "Paradise Papers" revealed that Hamilton was given a refund of more than $4 million after his Bombardier Challenger 605 was imported to the Isle of Man in 2013.
Red Bull's Max Verstappen believes the cars designed by Mercedes have helped Hamilton to win four times.
Vettel will be seen in action in the next Formula One race of 2017, which will take place on November 12.
From 2021, teams will still use the 1.6 Litre, V6 Turbo Hybrid, but - crucially - it will be run at 3,000 rpm higher to increase noise.
Hamilton is currently maintaining a 66-point lead over Germany's Sebastian Vettel of Ferrari with three F1 races remaining, he is looking forward to claiming his fourth world championship this season.
The Finish driver refused to give up on Ferrari's season and stressed that his team is still capable of clinching victories in remaining four races of the season.
The Mercedes driver was quickest in the afternoon practice with a lap of 1 minute, 48.719 seconds, .799 seconds ahead of Force India rival Esteban Ocon.
The two-time world champion explained that the straights in the Sepang circuit, where this weekend's race is to take place, requires more speed and power in the engines.
Honda has been supplying McLaren with engines since 2015, an attempt at rekindling what was once a hugely successful partnership in the glory era of Alain Prost and Ayrton Senna.
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