TennisEdge's AI model finds no betting value in S. Sierra vs A. Kalinina (Rome on 2026-05-07) — the market is efficient, with A. Kalinina favoured at 1.43.
Independent estimates of who wins, each from a different method. The blend is what the bot prices against the market.
| Method | S. Sierra | A. Kalinina |
|---|---|---|
| Elo ratings-based, surface-weighted |
51.4% | 48.6% |
| Machine learning 29-feature gradient-boosted model |
56.6% | 43.4% |
| Serve / return point-by-point simulation |
56.8% | 43.2% |
| Blend what the bot actually prices off |
54.9% | 45.1% |
| Market implied de-vigged from the opening odds |
35.2% | 64.8% |
We publish how well these score against the closing market, including where they lose: how accurate are tennis predictions?
| Player | Surface | Elo | Record | Matches |
|---|---|---|---|---|
| S. Sierra | clay | 1799 | 152–59 | 211 |
| A. Kalinina | hard | 1699 | 83–69 | 152 |
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 1–0 over 1 meeting. Full record.
| Date | Event | Surface | Winner | Score |
|---|---|---|---|---|
| May 7, 2026 | Rome | clay | S. Sierra | 2 - 0 |
| 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 |
| L | A. Bondar | 0 - 2 | Aug. 3, 2026 |
| L | T. Korpatsch | 2 - 1 | July 24, 2026 |
| W | M. L. Carle | 0 - 2 | July 22, 2026 |
| W | K. Quevedo | 0 - 2 | July 20, 2026 |
| L | P. Badosa | 2 - 0 | July 14, 2026 |
All May 7, 2026 results & picks →
Math-only prediction: no LLM calls used