Solana Sierra vs Qinwen Zheng — Bad Homburg Round of 32

Clear favourite · Zheng Q. clearly ahead, but no certainty

Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.

The Umpiry Score combines match-context factors — matchup, form, fatigue, travel and motivation — into a single 0–10 score, updated daily. Read how it works.

Direction of recent form — results vs Elo expectation blended with serve/return vs each player's baseline, over the last few months. About

Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About

Sierra S.: 1 day rest · 1 match, 15 games (7d) · Zheng Q.: 4 days rest · 2 matches, 55 games (7d). Higher means fresher. About