Valtteri Bottas topped the times on a red flag littered day of testing. It was a troubling day for both Ferrari and Red Bull as technical problems and offs on track interrupted their testing programmes. Bottas started the day with fast laps, but had to fight for the top time with Max Verstappen and Felipe Massa. The Mercedes driver ended the day top with a time just over a tenth of a second faster than former teammate. McLaren apparently didn’t have any problems today, though they did have very limited running with long periods in the garage and the car stopping in the pit lane at the end of the day for currently unknown problems. Ferrari also spent a lot of time in the garage today. Fluid system checks kept Kimi Raikkonen in the pits for two hours in the morning, but the Finn managed to put in some good laps once he got back out to end the day third in the timing order. The good news ended when Raikkonen span off at the exit to turn three, hitting the barrier. The Ferrari’s front wing was broken and the front left suspension was damaged. It was a blow that brought an early end to the team’s day. Red Bull’s day was similar in fortune. After battling at the top of the timings in the morning session, Verstappen was given an extended lunch break when the team needed to change the Renault engine. Four hours later, the team managed to get back out, with Verstappen running race runs in the afternoon. Verstappen's run came to an end just two laps short of a fall race distance, though, when he came to a stop on track due to the same problems that they had seen in the morning. Many teams spent the afternoon completing long runs, including Mercedes. Lewis Hamilton completed a 20 lap stint on ultrasoft tyres, leading many to believe we won’t be seeing many pit stops this season… For more thoughts on Formula One and the latest news, head to the Formula One sub forum here at RaceDepartment. More good times for Williams – a sign of more to come? And what do you think of the long stint on the ultrasoft tyres? Let us know your thoughts in the comments below.