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Samsonova holds the higher global Elo, 1736 to 1691, and the narrower edge on hard courts, 1647 to 1633, two gaps that point the same way without being wide.

Their weeks in Guadalajara have looked different. Samsonova needed deciding sets against Marta Kostyuk (4-6 6-2 7-5) and Kayla Day (7-6 2-6 7-6) after beating Elsa Jacquemot 7-6 6-2. Stearns has not dropped a set: 6-3 6-2 over Emiliana Arango, 6-2 7-5 over Diane Parry, 7-6 6-4 over Sloane Stephens.

Form over the recorded sample is 7W-3L for Samsonova and 6W-4L for Stearns; both lost their listed matches at the US Open and Cincinnati. No meetings appear in the available head-to-head data, though that coverage is unknown, so the evidence stops short of a clear lean.

On the global Elo scale Ben Shelton sits at 1932 to Jakub Mensik's 1812. No surface Elo is supplied for either player, and the surface for this Davis Cup tie is not given, so any surface-specific read is unavailable.

Shelton's recorded form is 8W-2L, with listed wins over Denis Shapovalov, Stefanos Tsitsipas, Carlos Alcaraz in five sets and Frances Tiafoe at the US Open, then a loss to Alexander Zverev on 13 September.

Mensik is 7W-3L in his sample, beating Shintaro Mochizuki and Jurij Rodionov before a five-set loss to Learner Tien, plus a win over Rinky Hijikata and a defeat to Thiago Tirante. Recorded meetings stand 2-2, so the head-to-head does not separate them; the Elo edge and Shelton's win list are the clearest available markers.

Elo separates these two by a single point: Tabilo 1693, Merida 1694, both on the global scale; no surface Elo was supplied, and the surface itself is unknown.

Tabilo's recorded form is 6W-4L, including US Open wins over Alexei Popyrin and Yannick Hanfmann before a loss to Alexander Zverev, plus a Cincinnati win over Jan-Lennard Struff and a loss to Rafael Jodar. Merida is 4W-3L, with US Open wins over Andrey Rublev and Marton Fucsovics, then a loss to Alex Michelsen; in Cincinnati he beat Zizou Bergs and lost to Taylor Fritz.

No meetings appear in the available data, which does not confirm a first meeting. Both samples cover at most ten matches within ninety days, so the evidence stops short of a favourite.

Paula Badosa holds the edge on both comparable scales: 1730 to 1651 on global Elo and 1673 to 1617 on hard-court Elo. The form samples are level, each recorded at 7W-3L across the last ninety days.

Mary Stoiana has won her two logged matches in Sao Paulo, over Dominika Salkova 7-6 6-1 and Claire Liu 6-3 7-5, after a loss to Julia Riera in Barranquilla and a US Open defeat to Alexandra Eala. Badosa's Sao Paulo entries show wins over Justina Mikulskyte 6-3 6-2 and Jazmin Ortenzi 4-6 6-2 6-2, plus a US Open win over Daria Kasatkina and losses to Coco Gauff and Mayar Sherif.

No meetings appear in the available data, and career coverage is unknown, so the head-to-head offers nothing here.

On the global Elo scale, Vacherot sits at 1712 and Virtanen at 1584, the only rating comparison available here: surface Elo is missing for both players, and the surface itself was not supplied.

The recorded form windows point the other way, mildly. Virtanen is 5W-5L, with wins over Jack Pinnington Jones and Ugo Blanchet at the US Open and a five-set loss to Andrey Rublev on 31 August 2026. Vacherot is 3W-5L, beating Aleksandar Kovacevic and Kamil Majchrzak at the US Open before losing to Frances Tiafoe on 5 September 2026.

No meetings between them appear in the available data, though career coverage is unknown. That leaves a clear Elo edge for Vacherot and little else the evidence settles.

The ratings barely separate them. Charaeva holds 1607 global to Blinkova's 1599, and on hard courts 1559 to 1556 — an edge too slim to call decisive on this evidence alone. Both carry a 6W-4L record across their recorded samples of at most ten matches in the last ninety days.

Blinkova's Sao Paulo path has been straight-sets: 6-1 6-3 over Carol Young Suh Lee, then 6-3 6-0 against Vendula Valdmannova, after a three-set loss to Claire Liu in Barranquilla. Charaeva needed 3-6 7-6 6-3 to pass Xiaodi You, then beat Elina Avanesyan 6-2 6-3; her listed August results include losses to Susan Bandecchi and Nikola Bartunkova.

No meetings appear in the available data, and career coverage is unknown, so no head-to-head read is possible.