TennisEdge's AI model finds no betting value in S. Sierra vs E. Seidel (Bad Homburg on 2026-06-20) — the market is efficient, with S. Sierra favoured at 1.57.
Independent estimates of who wins, each from a different method. The blend is what the bot prices against the market.
| Method | S. Sierra | E. Seidel |
|---|---|---|
| Elo ratings-based, surface-weighted |
53.9% | 46.1% |
| Machine learning 29-feature gradient-boosted model |
58.7% | 41.3% |
| Serve / return point-by-point simulation |
53.1% | 46.9% |
| Blend what the bot actually prices off |
56.4% | 43.6% |
| Market implied de-vigged from the opening odds |
58.9% | 41.1% |
We publish how well these score against the closing market, including where they lose: how accurate are tennis predictions?
Our own ratings, computed from match results since 2018. Players with fewer than 5 rated matches are omitted rather than shown at a provisional starting value. Last updated May 29, 2026.
S. Sierra leads 2–0 over 2 meetings. Full record.
| Date | Event | Surface | Winner | Score |
|---|---|---|---|---|
| June 20, 2026 | Bad Homburg | grass | S. Sierra | 2 - 0 |
| Aug. 21, 2024 | WTA US Open | hard | S. Sierra | 2 - 1 |
| L | S. Stephens | 0 - 2 | Aug. 4, 2026 |
| L | T. Prozorova | 1 - 2 | July 27, 2026 |
| L | C. Gauff | 1 - 2 | July 1, 2026 |
| W | A. Bondar | 2 - 1 | June 29, 2026 |
| L | Q. Zheng | 1 - 2 | June 22, 2026 |
| W | D. Galfi | 0 - 2 | Aug. 4, 2026 |
| L | D. Snigur | 1 - 2 | July 20, 2026 |
| L | A. Kulikova | 0 - 2 | July 7, 2026 |
| L | L. Noskova | 0 - 2 | June 30, 2026 |
| L | S. Sierra | 2 - 0 | June 20, 2026 |
All June 20, 2026 results & picks →
Math-only prediction: no LLM calls used