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It was only the third win of Raducanu's career against a player ranked in the world's top 10 - and first on a hard court.

The most eagerly-anticipated match of the Australian Open so far will be the first time they have played at a hard court major.

But Stephens, who has pedigree on the hard court as a former US Open champion, pegged Sabalenka back, breaking back twice for 4-3 as Sabalenka made a series of unforced errors.

On an indoor hard court which suits her skillset, Boulter used her punishing first serve and pacy forehand to cruise past Germany's Laura Siegemund and Canada's Leylah Fernandez.

Nadal won 24 of his 40 matches against Federer, including their first meeting on a Miami hard court in 2004.