Trusting her natural ability, and the work she is doing with coach Wim Fissette to further improve, has also been the key to Swiatek turning around her season.

After a slump by her lofty standards at the start of the year, the former long-time world number one started the final major of the season as most people’s pick for the trophy.

The recently crowned Wimbledon champion, who won the US Open in 2022, underlined her credentials on the American hard courts with victory at the Cincinnati Open.

Swiatek was far from her best against 29th seed Kalinskaya, with a low serve percentage particularly damaging, and her relief was demonstrated by an animated celebration.

“I’m happy that I came back, kept being positive and figured it out,” Swiatek added.

In the other night-session match, Brazil’s Beatriz Haddad Maia made light work of Greece’s Maria Sakkari after the pair took to court at 11:15pm local time.

Haddad Maia, seeded 18th, moved fast to wrap up a 6-1 6-2 victory, booking a last-16 match with Wimbledon runner-up Amanda Anisimova.