And she is 20-year-old Naomi Osaka.
Osaka, born in Japan, raised on Long Island, and a Florida tennis resident now, made her first big splash at Indian Wells but had been quiet since then.
Turns out she was saving her energy for the big dance.
She vaults from No. 19 right into the top 10, settling in at No. 9. And in the race to the Tour finals in Singapore, she’ll stand at No. XX.
France’s Caroline Garcia, even though she lost in the third round, climbed a couple of precious spots in the rankings and checks in at a new career best of No. 4.
ON THE UPSWING
Angelique Kerber (GER): No. 4 ———> No. 3
Naomi Osaka (JPN): No. 19 ———> No. 7
Serena Williams (USA): No. 26 ———> No. 16 (Serena eases by her sister for the first time in … a long time.
Lesia Tsurenko (UKR): No. 36 ———> No. 26 (The 29-year-old survived – almost literally – her best US Open ever and reaches a career high).
Dominika Cibulkova (SVK): No. 35 ———> No. 29 (After an inactive summer, her fourth-round showing was a surprise).
Petra Martic (CRO): No. 47 ———> No. 38 (A first-round loser in New York, she won the Oracle Challenger in Chicago).
Su-Wei Hsieh (TPE): No. 43 ———> No. 40 (Hsieh squeezes past Shuai Zhang and becomes the No. 1 player from China/Taipei).
Qiang Wang (CHN): No. 52 ———> No. 44 (The little-known Chinese player ties he career high with a third-round effort in New York).
Rebecca Peterson (SWE): No. 61 ———> No. 54 (She’s at a new career high after reaching the third round in New York. But she can still walk the streets of Manhattan incognito).
Victoria Azarenka (BLR): No. 79 ———> No. 62 (She would have wanted better than the third round. But at least she’s still moving in the right direction).
Vera Lapko (BLR): No. 72 ———> No. 64 (A career high for the 19-year-old from Belarus)
Marketa Vondrousova (CZE): No. 103 ———> No. 71 (a nice effort to make the fourth round in New York).
Eugenie Bouchard (CAN): No. 137 ———> No. 111
Karolina Muchova (CZE): No. 203 ——–> No. 143 (The vanquisher of Garbiñe Muguruza rises to a career high).
Francoise Abanda: No. 211 ———> No. 196
ON THE DOWNSWING
Sloane Stephens (USA): No. 3 ———> No. 9
Madison Keys (USA): No. 14 ———> No. 18
Venus Williams (USA): No. 16 ———> No. 21
Shuai Zhang (CHN): No. 34 ———> No. 41
Coco Vandeweghe (USA): No. 25 ———> No. 49 (Her ankle was still not reach for singles and defending her 2017 result, but she made up for it with a doubles title as she teamed up with Ashleigh Barty).
Kaia Kanepi (EST): No. 44 ———> No. 57 (The Estonian upset Simona Halep in the first round, but even though she reached the second week she still didn’t do as well as last year).
Agnieszka Radwanska (POL): No. 48 ———> No. 59
Monica Niculescu (ROU): No. 62 ———> No. 81
Elena Vesnina (RUS): No. 67 ———> No. 89
Lucie Safarova (CZE): No. 69 ———> No. 91
Mona Barthel (GER): No. 77 ———> No. 94
Jennifer Brady (USA): No. 66 ———> No. 96
(For the full updated WTA rankings, including the updated race to Singapore, where Osaka jumped from No. 15 to No. 4, click here).