Jerez de la Frontera, Spain: Red Bull's frustrating start to Formula One testing came to a sputtering halt on Friday as four days of car problems ended with another early retirement, this time due to a mechanical fault.
Daniel Ricciardo managed just seven laps around Jerez Circuit before pulling out of the morning session to focus on getting the RB10 ready for the next preseason test in Bahrain. (Also read: Daniel Ricciardo relishing Red Bull challenge)
Williams led the time sheets with Felipe Massa clocking a best lap of 1 minute, 28.229 seconds from 89 laps, nearly 1 second ahead of former Ferrari teammate Fernando Alonso. Alonso ran a session-high 115 laps, with McLaren driver Kevin Magnussen following with 110 laps.