Red Bull Racing ace Max Verstappen leads the 2021 F1 world championship ahead of seven-time F1 world champion Lewis Hamilton. But in the constructor’s championship Mercedes leads ahead of nearest rival Red Bull Racing. Mercedes decided some time ago to stop the development of this 2021 F1 car. The Silver-arrows now focus on 2022, when the regulation widely change.

But Mercedes have been doubted with the rival Red Bull asking a curious development in their F1 championship battle. In the first-half this season Red Bull shows the consistent pace, but recent some races Mercedes heavily improves their performance.

Red Bull F1 team advisor Helmut Marko claims that Mercedes have made great improvements by continuing to boost their speed. He also admitted the team put “more downforce on the rear wing” than Red Bull, but believes something has been “weird” with Toto Wolff’s men since British Grand Prix.

Marko told F1-Insider.com: “I don’t think Mercedes did anything illegal.

“But something has been weird since Silverstone. So, it is now up to us to research why they are suddenly so fast. Is it just the engine or something else?

“We now have to workday and night to uncover its secret and then counter it. As quickly as possible. It is up to us.”

“If the differences in performance remain the same as in Istanbul, we will have a problem.

“Of the six racetracks, only the courses in Mexico and Sao Paulo play a part in our cards because of their altitude. At the moment the rest clearly seems to be Mercedes-Land.”

2021 F1 title is set to go to the wire – Toto Wolff

“I don’t think you can say that with absolute conviction,” Wolff said. “I believe we have a really good package now.

“The car is competitive and was very competitive [in Turkey] and if it wasn’t for a grid penalty I think we would have had every chance to finish first and second.

“That would have meant eight points more but I’m looking carefully optimistic into the future.”

“Austin [for the United States Grand Prix] is a track we like and is another opportunity but I’m under no illusion this is very much going to go to the end in the drivers’ championship.”