Fernando Alonso believes the success Red Bull and Mercedes have had in recent seasons are completely 'deserved'.
Red Bull dominated Formula one from 2010 to 2014, winning four consecutive Drivers' and Constructors' titles with Sebastian Vettel as the lead driver.
At the start of this year, some radical technical changes were brought into the sport and Mercedes have won every race so far under the new rules, claiming one-two finishes in each of the last five races.
Although the dominance of these two teams have been the target of constant criticism, Alonso - who narrowly missed out to Vettel in 2010 and 2012 - appreciates the hard work that's gone into designing a title-winning car.
"We saw Red Bull have a big advantage in the last four years and now we see a similar, or even more advantage for Mercedes, but it's the way it is," Alonso told Autosport.
"Red Bull did a better job than the other teams, they deserve the championships they have.
"Mercedes is now leading both championships because they did a better job than the others - not only on the engine side, also on the car side.
"There are three or four teams with Mercedes engines that have the same possibilities and are one lap behind the two Mercedes.
"They did something good and it's a motivation for us to work better, because we know there are some other teams exploiting the new cars in a better way."