Red Bull team boss Christian Horner is expecting a "flat-out" fight for supremacy in Formula One over the next 18 months.

Austrian constructor Red Bull have been the dominant force in F1 over the past few years, with Max Verstappen winning three straight drivers' titles and the team taking the constructors' trophy in 2022 and 2023.

The early stages of the 2024 season followed a similar pattern with flying Dutchman Verstappen winning four of the opening five races but there have now been seven different victors through 14 rounds.

Verstappen still holds a healthy 78-point lead from second-place Lando Norris in the driver standings but McLaren are only 42 points adrift of Red Bull in the constructor table, with Ferrari 63 back and improving Mercedes 142 behind.

Horner, in quotes reported by F1's official website, thinks there is going to be a battle between all four of those F1 heavyweights in the near future.

"I think it’s great for the sport, and it was almost inevitable when you get consistency of regulations, you always get convergence," he said.

"I remember when I first came into Formula 1, Ron Dennis banging that drum back in 2005. Convergence has always brought the teams together. 

"Of course we have a big regulations change in 2026 that will cause divergence but, between now and then, the next 18 months I think it will be flat-out between the four teams."

F1 returns after a near month-long break with the Dutch Grand Prix this weekend, Verstappen's home race.