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.
MARANELLO, Italy : Simona de Silvestro moved a step closer to achieving her dream of competing in Formula One next year after a first day of in-car testing with Sauber. The Swiss driver completed 112
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