Guadalajara & Sao Paulo predictions, September 16, 2026: Kostyuk vs Townsend, Jovic vs Sonmez

A spot in the next round is at stake on Wednesday, when Marta Kostyuk goes up against Taylor Townsend in the Guadalajara round of 16. Marta Kostyuk is 7-3 across recent matches. Taylor Townsend has won 7 of the last 10.

On paper it's close: comparable ratings, comparable serve numbers, small margins everywhere. A tiebreak or two would surprise nobody, with Kostyuk fractionally more likely to land the big points.

A spot in the next round is at stake on Wednesday, when Iva Jovic goes up against Zeynep Sonmez in the Guadalajara round of 16. Iva Jovic comes in at 6 wins from the last ten. Zeynep Sonmez has dropped 2 straight and sits at 4-6 over the last ten.

Iva Jovic simply rates much higher on hard, and our number follows from it. Jovic should have enough here, though Sonmez has the tools to make the scoreboard uncomfortable.

Wednesday's Sao Paulo round of 32 pits Dominika Salkova against Jessica Bouzas Maneiro on hard. Jessica Bouzas Maneiro is 4-6 across recent matches. Dominika Salkova is searching for form, having lost 2 in a row (4 of the last 10).

Neither the serve numbers nor the ratings separate these two by much, which is why our number stays close to even. This one is close to a coin flip, and the lean toward Maneiro is exactly that — a lean.

A spot in the next round is at stake on Wednesday, when Janice Tjen goes up against Sloane Stephens in the Guadalajara round of 16. Janice Tjen has won 4 of the last 10. Sloane Stephens is 4-6 across recent matches.

Tjen's 67.5% behind the first serve (against 60.8% for Stephens) means break chances should be scarce in one direction. Little separates them; Tjen gets the nod on the finest of margins.

A spot in the next round is at stake on Wednesday, when Caroline Dolehide goes up against Magdalena Frech in the Guadalajara round of 16. Magdalena Frech limps in on a 2-match losing skid, just 4 wins in 10. Caroline Dolehide comes in at 4 wins from the last ten.

Magdalena Frech is clearly higher-rated on hard — our number puts Frech around 61%. The edge belongs to Frech — real, but not the kind you take for granted at this level.

A spot in the next round is at stake on Wednesday, when Darja Semenistaja goes up against Teodora Kostovic in the Sao Paulo round of 16. Teodora Kostovic has dropped 2 straight and sits at 4-6 over the last ten. Darja Semenistaja is searching for form, having lost 7 in a row (3 of the last 10).

Kostovic's 63.2% behind the first serve (against 57.7% for Semenistaja) means break chances should be scarce in one direction. Semenistaja comes in off a compressed schedule; Kostovic comes in off a compressed schedule. This one is close to a coin flip, and the lean toward Kostovic is exactly that — a lean.

Kaitlin Quevedo and Whitney Osuigwe meet in the round of 32 at Sao Paulo on Wednesday. Kaitlin Quevedo has won 4 of the last 10. Whitney Osuigwe limps in on a 2-match losing skid, just 4 wins in 10.

The serve is where this match separates: Quevedo has been winning 60.4% of first-serve points to Osuigwe's 53.6%, and on hard that gap compounds fast. This one is close to a coin flip, and the lean toward Quevedo is exactly that — a lean.

A spot in the next round is at stake on Wednesday, when Carolina Alves goes up against Suzan Lamens in the Sao Paulo round of 32. Suzan Lamens limps in on a 4-match losing skid, just 4 wins in 10. Carolina Alves has dropped 4 straight and sits at 2-8 over the last ten.

Hold strength tells the story — 61.3% versus 57% on first-serve points in Lamens's favor. Little separates them; Lamens gets the nod on the finest of margins.