Formula One title rivals Lewis Hamilton and Max Verstappen have gone wheel-to-wheel in all three races this season, but both expect the racing to stay tough but fair as the pressure rises.

Hamilton’s victory in Portugal on Sunday stretched the Mercedes driver's championship lead over Red Bull’s Dutch youngster to eight points. In a sport where fine margins and small mistakes can have big outcomes, and with a record 23 races scheduled this year, the seven-times world champion saw plenty of battles to come.

“We’re going to be sick of each other at the end I would imagine, or sick of racing, because there are so many races,” joked Hamilton.

The rivalry could boil over with so much at stake, 36-year-old Hamilton chasing records while 23-year-old Verstappen seeks a first crown, but the tone on Sunday remained one of mutual respect.

“I always have full trust in Lewis that we always give each other enough space,” said Verstappen, who has won one race and finished second twice.

“I just second that,” said Hamilton. “I think it is naturally down to respect and I think both (of us are) very, very hard but fair and I think that’s what makes great racing and great racing drivers.”

Hamilton, superlative on Sunday, has also erred — skidding off in race two at Imola before fighting back from ninth to second. He won against the odds in the Bahrain season-opener after Verstappen, on pole, ran wide while overtaking him.

Verstappen won at Imola, muscling past Hamilton on the opening lap, and might have taken pole in Portugal from Mercedes’ Valtteri Bottas but again went just too far off and had a fastest time deleted.

Both made mistakes on Sunday that allowed the other to overtake.

“This championship will come down to all the marginals and it’s still at an early stage,” said Red Bull boss Christian Horner.

“Max is driving the wheels off the car and it’s super, super tight between us. We’re eight points behind in the drivers’ (standings), it’s nothing. This championship is going to be a marathon rather than a sprint.”