Miami Open

Regulations require any non-US citizen to have a Covid vaccination before entering the country.

Serb Djokovic, 34, told the BBC last month that he had not been vaccinated.

The 20-time Grand Slam winner was included in the draw for both events, but has since posted on Twitter that he knew it was "unlikely" he could travel.

He is likely to make his return to the tour at the Monte Carlo Masters in April.

The Indian Wells draw will be less balanced following the late withdrawal of Djokovic, who was seeded second.

At the scene of his first meeting with Nadal, which took place 13 years ago, Federer was able to make it four wins in a row against the Spaniard, following up his recent Masters 1000 success in Indian Wells by claiming his third Miami title and first since 2006.

The 35-year-old Swiss has now won three of the four tournaments he has competed in this year, a stunning return following the injury troubles that blighted his previous season.