The win also set a record, one that Hamilton had previously shared with seven times champion Michael Schumacher, of 41 wins from pole position.
Lewis Hamilton has played down his Mercedes team's chances of challenging for the Formula One title after rivals Sebastian Vettel and Fernando Alonso talked them up.
Fernando Alonso drove Ferrari's new Formula One car for the first time in Barcelona on Tuesday and said it was on another planet compared to the tricky one he wrestled into title contention last season.
Fernando Alonso will test his new Ferrari for the first time in Spain on Tuesday while former champions Williams bring Formula One's 'launch season' to a close as the last team to unveil their 2013 car.
Improving qualifying, without upsetting the race pace, will be the immediate priority for Ferrari whose last driver's title was with Kimi Raikkonen in 2007 and who last enjoyed constructors' success a year later.
Spaniard Fernando Alonso won his home Formula One Grand Prix in Barcelona on Sunday, the Ferrari driver beating Finn Kimi Raikkonen of Lotus into second place.
Chelsea will discuss a contract extension with Ivorian striker Didier Drogba after next week's Champions League final, the Premier League club's chief executive Ron Gourlay said on Thursday.
Ferrari's Fernando Alonso warned his Formula One rivals on Monday that he was in better shape than ever.
Lewis Hamilton wrapped up his pre-season testing with Mercedes in eye-catching style on Saturday with a lap that was easily the fastest seen so far this year in Barcelona.
New McLaren driver Sergio Perez set the fastest lap on the second day of Formula One testing at Barcelona's Circuit de Catalunya on Wednesday.
Germany's Adrian Sutil and Frenchman Jules Bianchi, rivals for the coveted last remaining seat on the Formula One grid with Force India, will both test for the team in Barcelona this week.
Formula One expects to run a shortened season of 15-18 Grands Prix once racing can resume after the coronavirus pandemic, hopefully during the European summer, chairman and chief executive Chase Carey said on Monday. The original 2020 calendar had a record 22 races but the season has yet to start with the first eight postponed or cancelled and more likely to be called off.
The Ferrari driver's best time of one minute 16.231 seconds was close to the 2018 Spanish Grand Prix pole time by Lewis Hamilton for Mercedes.
Venezuelan Pastor Maldonado will start Sunday's Spanish Grand Prix on pole position for Williams after Lewis Hamilton was sent to the back of the grid because McLaren failed to put enough fuel in his car.
In the interests of better visibility, teams were told last month they could fix mirrors to the halo head protection device that encircles the cockpit and that became mandatory this season.
Media reports this week suggested that British energy drink firm Rich Energy was leading a consortium seeking to purchase the Silverstone-based team for 200 million pounds ($278.66 million).
Nine people were hurt when the Williams garage was gutted by fire while the Formula One team were celebrating their first win in nearly eight years at the Spanish Grand Prix on Sunday.
McLaren's Jenson Button set the pace in Spanish Grand Prix practice on Friday with half the field separated by little more than a second.
Formula One champions Red Bull have changed their pitstop procedures for Sunday's showcase Monaco Grand Prix after accusing Ferrari of shadowing them at the last race in Spain.
Formula One stragglers Hispania have refused to rule out a protest against most other teams that could cast a cloud of uncertainty over Sunday's Spanish Grand Prix.
Rosberg and triple world champion Lewis Hamilton shared testing duties on Tuesday, with the Briton taking over in the afternoon for a race simulation. Together, they did 169 laps without a hitch
Triple Formula One world champion Lewis Hamilton hailed his 'fantastic' Mercedes after wrapping up the first pre-season test with another 99 laps before lunchtime on Thursday.
Says Real Madrid weaker without the Portuguese
Force India's pointless streak continued as Paul di Resta and Adrian Sutil finished 12th and 13th respectively in the Spanish Grand Prix at the Circuit de Catalunya in Barcelona on Sunday.
Ferrari were forced to replace the rear wing on their cars at the Spanish Grand Prix on Saturday after Formula One's governing body declared it illegal.
Lewis Hamilton has recognized that he is about as likely to drive for Ferrari in the next five years as he is to have the Spanish Grand Prix crowd cheering him on against Fernando Alonso.
Jose Mourinho is ready to haunt Barcelona in the Champions League semi-finals again on Wednesday, this time with Real Madrid.
A prototype 'halo' head protection device made its Formula One test debut in Spain on Thursday, with Kimi Raikkonen declaring visibility to be 'okay' after lapping with it attached to the cockpit of his Ferrari.
'It's a great job by the team. Usually in the first day you don't get that many laps so I'm really happy'
Sporadic rain literally poured cold water on Force India's testing at the Circuit de Catalunya with Adrian Sutil setting the seventh quickest time of the day.
Ferrari will be looking for answers in Formula One testing this week after champions Mercedes were more dominant than ever in Sunday's Spanish Grand Prix.
Fernando Alonso can see a brighter future for McLaren, despite turning up at his home Spanish Grand Prix on Thursday with a stye in his eye.
Australian Mark Webber won the Spanish Grand Prix for rampant Red Bull on Sunday after leading from start to finish at Formula One's most predictable circuit.
Australian Mark Webber won the Spanish Grand Prix for rampant Red Bull on Sunday after leading from start to finish at Formula One's most predictable circuit.
Vitantonio Liuzzi clocked the sixth fastest time as Force India began its final test ahead of this year's World Championship with the Italian driver carrying out set-up work and pit-stop practice.
Formula One driver Karun Chandhok had a spring in his step at the Spanish Grand Prix on Saturday after recovering from a bout of food poisoning that laid him low earlier in the week.
Mercedes brought intrigue to Formula One testing on Thursday with television images showing Lewis Hamilton moving his car's steering wheel forwards and backwards as he drove. The mechanism appeared to alter the alignment of the front wheels, with the six-times world champion pulling the wheel towards him on the straights and pushing it back as he approached corners.
Lewis Hamilton did 94 laps of Barcelona's Circuit de Catalunya on the soft C2 compound in a sunny afternoon session
MotoGP world champion Valentino Rossi showed impressive pace in a Formula One car at the end of two days of testing with Ferrari in Barcelona on Thursday.
Argentina coach Diego Maradona named a squad on Thursday for a friendly he is banned from taking part in.