Garbine Muguruza arrives in New York as the favourite after backing up her Wimbledon triumph with a Cincinnati success.
The Spaniard had still looked a gamble for the season's final major heading, with two lower-tier titles representing her only triumphs other than the 2016 French Open and this year's Wimbledon.
However, she answered plenty of questions in Cincy, beating the top two, Karolina Pliskova and Simona Halep, in straight sets, including a final 6-1 6-0 mauling of the latter.
A failure to make it past the second round at Flushing Meadows is one concern remaining, but the time has never been better for her to make her mark.
The 'Race to Singapore' leader also has the added motivation of becoming world No 1 in New York, something that looks all the more likely given Pliskova and Halep's struggles when faced with major pressure.