Victories for Perez in both Saturday’s sprint and Sunday’s grand prix in Azerbaijan left the Mexican just six points shy of his team-mate after the first four events of the 2023 campaign.
Horner stressed that the team is happy to see the points shared out between the duo as it helps to lift both drivers clear of the rest of the field.
He says the strong showing from both drivers will help create a buffer that will be useful if rivals improve their form and Red Bull’s cost cap penalty starts to hit development as the season progresses.
“At moment it's the two of them,” said Horner of the title battle. “There's a slight gap between the rest of the field, but there's 19 more races to go, and five sprint races.
“There's a huge amount of racing and a whole variance of different circuits to go through, so it could ebb and flow between the two of them.
“Reliability will be a key factor. And what we're more focused on as well at the moment is building a buffer with both of the drivers.
Source: Autosport