Williams hopeful Nick Heidfeld was fastest at the start of what could be a decisive five-day test programme with the Formula One team in southern Spain on Monday.
Scattered showers marred Nick Heidfeld's test drive for Williams in southern Spain.
Nick Heidfeld's test with Williams, due on December 9, has been brought forward to Wednesday.
Chief operations engineer Sam Michael said Williams, runners-up to Ferrari last season, were "already miles in front of where we were last year".
The two drivers are vying for a place alongside Australian Mark Webber at BMW-Williams for next season.
Germany's Nick Heidfeld was second fastest as he did his best to impress Williams in a wet and windy Formula One test session.
The Formula One team will try out the sons of former champions Nelson Piquet and Keke Rosberg next week.
Force India's 2015 Formula One car will not make its track debut until the third and final pre-season test in Barcelona some two weeks before the first race in Australia, the team said on Friday.
Indian Grandmaster P Harikrishna started his campaign by outclassing Eric De Haan of Holland in the first round of the Masters' section of Tradewise Gibraltar Chess festival at the Caleta in Gibraltar.
Formula One legend Michael Schumacher had reportedly "reacted with his mouth" during a secret visit to the Grenoble hospital by his former Ferrari teammate Felipe Massa.
The past week saw a lot of brilliance in sports. It started with Juventus and Barcelona lighting up the Champions League with their inspiring football and, later in the week, Mercedes' Nico Rosberg stoked the F1 circuit in Spain, capping a brilliant win to cut teammate Lewis Hamilton's lead to 20 points. Rediff.com has this, and many more memorable moments snapped right here.
Williams claimed a first on Wednesday by revealing their 2015 car before any of their Formula One rivals had taken the wraps off theirs.
Williams provided a first glimpse of their new Formula One car with a confident prediction that it would be good enough to move the former champions back up the grid after a dire 2013 campaign.
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Force India, who finished sixth overall last year but whose owners have had financial troubles, missed the first test in Jerez.
Ferrari were top in three of the four days in Jerez and second fastest on both days in Barcelona.
Young Indian golfer Aditi Ashok notched up her second successive top-10 finish by finishing tied-sixth at the Volunteers of America LPGA Texas Classic, in Texas.
Finland's Valtteri Bottas and Brazilian Felipe Massa will be racing for Williams again next season, the Formula One team said on Thursday in an announcement, ending speculation about the possible return of Jenson Button.
Nico Rosberg vowed 'maximum attack' in a new title battle Lewis Hamilton.
Lotus expect to be far more competitive this season with a new Formula One car that they hailed as a massive step forward on Monday.
Lewis Hamilton has competed with Alonso, Raikkonen, Button, Rosberg, Schumacher and Vettel, champions all of them, and he has come out on top.
The new livery brings a fresh trackside image for the team with the introduction of black alongside the traditional colours of saffron, white and green.
Fernando Alonso made a troubled start to testing McLaren's new Formula One car
Force India revealed an aggressive new look for the 2015 Formula One season on Wednesday with Mexican driver Sergio Perez telling his compatriots he expected his best season yet.
Formula One champions Red Bull recognised on Saturday they were well behind rivals in pre-season testing but dismissed reports that Sebastian Vettel had "thrown a hissy fit" about the situation.
A summary of sports events and persons who made news on Monday
The timing of the news immediately triggered speculation that Frenchman Eric Boullier could be heading to McLaren, who were due to launch their 2014 car later in the day in an online presentation.
The Perth-born driver has yet to finish higher than seventh in a Formula One career that started in 2011 with now-defunct HRT but he now stands on the cusp of the big time with the dominant team of the last four years.
Formula One's 83-year-old commercial supremo Bernie Ecclestone said in May that an agreement had been signed for a street race in the Azeri capital, on the shores of the Caspian sea, next year.