The Formula One teams of 2015

The top two drivers in 2014 will be hoping this is the car that can bring the German team more success this season. Lewis Hamilton and Nico Rosberg occupied the first two positions in 11 of the 20 races last year as the British driver won the Drivers' Championship by 67 points from his rival. Mercedes won the Constructors' title at a canter and will again be a force to be reckoned with in 2015.

If you have not heard the news yet, 27-year-old German driver Sebastian Vettel (right) left Red Bull to join Ferrari for the new season. In testing, the Italian team looked good but it remains to be seen whether they can keep pace with Mercedes and win their first silverware since 2008. Expect Vettel's battles with veteran teammate Kimi Raikkonen - Ferrari's last champion - to also grab headlines.

Sebastian Vettel's old team will be finding its feet again after the German's departure. Team boss Christian Horner (pictured middle) still has some great drivers to fall back on, with Australian Daniel Ricciardo, who came third in the drivers' championship last year, partnering up with Daniil Kvyat this season. The young Russian is considered a real talent for the future.

Williams dominated F1 in the 1980s and 1990s, winning nine constructors' and seven drivers' titles. The English team has won neither since 1997 but a decent season in 2014 saw Valtteri Bottas (pictured left) claim six podium finishes and Felipe Massa (right) three. In the constructors' standings Williams came third, ahead of Ferrari and McLaren, but a repeat performance in 2015 will be tough.

After a long deliberation, McLaren chose to retain Jenson Button as partner to new signing Fernando Alonso this year, but the test drives for the former world champions did not go well. With new Honda engines, the cars suffered numerous reliability problems, before Alonso was involved in a crash in Barcelona which is causing him to miss the season opener in Melbourne. Its cause is still unknown.

Lotus have switched from a Renault to a Mercedes engine for the 2015 season, a pretty surefire indicator that the team can expect improvement after a miserable 2014 campaign. Some test runs in Barcelona went well but Lotus will be dependent on the form of drivers Pastor Maldonado and Romain Grosjean, who have both been involved in their fair share of accidents over the years.

The Red Bull junior team, Toro Rosso, will take to the track this season with two young drivers boasting famous family pedigrees. Carlos Sainz Jr. (left) is the 20-year-old son of the two-time world rally champion Carlos Sainz, while Max Verstappen (right), 17, is the son of former F1 star Jos Verstappen, who raced with Michael Schumacher at Benetton.

The UK-based Force India team still have doubts over their car. On the first day of testing the new VJM08 had to stay in the garage, and since then it has suffered technical problems. The driver pairing of Nico Hülkenberg and Sergio Perez came 9th and 10th respectively in the drivers' championship last year, and they will be aiming to do at least as well again this year.

The Swiss Sauber team are one of the biggest unknowns of the new season. Racing in a new color (blue) and with two young drivers, the team is trying to re-invent itself. Marcus Ericsson, 24, is expected to race with 22-year-old rookie Felipe Nasr, but a court case is still ongoing to decide the fate of last year's reserve driver, Giedo van der Garde, who claims he was promised a starting berth.

After nearly going bankrupt at the end of last season, Marussia will be returning to F1 again in 2015. British driver Will Stevens, who raced for the now-defunct Caterham team, and Roberto Merhi from Spain, are the team's drivers for this campaign.