TennisEdge's AI model finds no betting value in L. Samson vs M. Barthel (Warsaw on 2026-08-03) — the market is efficient, with L. Samson favoured at 1.53.
Independent estimates of who wins, each from a different method. The blend is what the bot prices against the market.
| Method | L. Samson | M. Barthel |
|---|---|---|
| Elo ratings-based, surface-weighted |
45.1% | 54.9% |
| Machine learning 29-feature gradient-boosted model |
63.9% | 36.1% |
| Serve / return point-by-point simulation |
64.8% | 35.2% |
| Blend what the bot actually prices off |
45.1% | 54.9% |
| Market implied de-vigged from the opening odds |
62.0% | 38.0% |
We publish how well these score against the closing market, including where they lose: how accurate are tennis predictions?
| Player | Surface | Elo | Record | Matches |
|---|---|---|---|---|
| L. Samson | hard | 1613 | 103–62 | 165 |
| M. Barthel | hard | 1675 | 102–75 | 177 |
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 Aug. 4, 2026.
M. Barthel leads 2–0 over 2 meetings. Full record.
| Date | Event | Surface | Winner | Score |
|---|---|---|---|---|
| Aug. 4, 2026 | Warsaw | hard | M. Barthel | 2 - 0 |
| March 13, 2024 | W75 Ricany | hard | M. Barthel | 2 - 0 |
| L | M. Barthel | 0 - 2 | Aug. 4, 2026 |
| W | K. Quevedo | 1 - 2 | Aug. 2, 2026 |
| W | L. Bronzetti | 0 - 2 | Aug. 1, 2026 |
| W | M. Ristic | 2 - 1 | July 31, 2026 |
| W | A. Soboleva | 0 - 0 | July 30, 2026 |
| W | L. Samson | 0 - 2 | Aug. 4, 2026 |
| L | F. Pace | Walk Over | July 30, 2026 |
| W | T. Gadamauri | 1 - 2 | July 28, 2026 |
| L | Y. Putintseva | 0 - 2 | July 21, 2026 |
| W | E. Vedder | 1 - 2 | July 20, 2026 |
All Aug. 3, 2026 results & picks →
L. SAMSON (A) vs M. BARTHEL (B) — WTA Warsaw, HARD
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MODELS vs MARKET
ELO: Samson 45.1% (favours Barthel 54.9%)
ML: Samson 63.9%
Market: implied Samson 62.0% (odds A 1.53 / B 2.50, book only)
Divergence: ELO is the lone outlier backing Barthel; ML + market agree on Samson ~62-64%.
value_pick B (+16.9% edge) is derived SOLELY from ELO.
NO exchange price — alt_markets & betfair_ml all null (book-priced small event).
ELO/RANKING SANITY
Samson ranked 203, ELO makes her a 45% dog — ELO likely UNDERSTATES a fast-rising
18yo on a 4-match win streak. Barthel ranked 240 but ELO favours her: rating inflated
by her Hamburg (WTA) title on 07-20, while her current level is ITF (1-2 since). This is
a "farmed/peaked ELO" signal → discount the ELO edge, do not lean on it.
RECENT FORM (last 5)
Samson: Won Bronzetti(1729,Strong) 7-5 6-4 GRIND/over-perf; Won Ristic(1643) TB 3set;
Won Soboleva(1500); Won Breaz(1500) 6-4 6-3 DOM; Lost Joint(1637). Deep qualifying run
at Targu Mures (CLAY) — match-sharp, SHARPENING (beat a Strong opp). Clay→hard TRANSITION.
Barthel: Lost Pace(Weak); Won Gadamauri(Weak) 3set grind; Lost Putintseva(1748);
WON Hamburg Final vs Vedder(1604) 07-20 = TITLE ~13d ago (clay); Won Yashina(1300).
Post-title FADE to ITF level. Clay/ITF→hard transition too.
FATIGUE (Step 2)
Samson: 4 matches/7d, 477min, b2b=2, played 2-set win yesterday (~neutral). Age 18 →
recovers fast; heavy load is context, not an edge.
Barthel: 2 matches/7d, 491min, last match 07-30. Age 36 → slower recovery, but no
extreme same-day/150min-yesterday spot. Roughly equal for betting purposes.
NARRATIVE
Barthel LETDOWN post-title but 13d old → WEAK. Samson SHARPENING & match-sharp.
Both transitioning off clay to hard (margin uncertainty widens; no directional cover read).
GATES
G1 edge-origin: PASS(numeric) — a +15% edge on Barthel exists pre-narrative BUT only vs
ELO, which is contaminated (title-inflated on a 36yo) and contradicted by ML+market.
G2 consensus: stake-tier — lone contaminated model (ELO) vs ML+market consensus for
the OTHER side → capped/lone_signal at best.
G3 fatal-risk: n/a (ML market).
VERDICT — PASS
The only edge here backs Barthel and rests entirely on a single suspect model (ELO
inflated by a 2-week-old title, current form ITF). ML and the market — the sharper
estimates — both sit ~62-64% on Samson, and the qualitative read agrees with them: a
match-sharp, sharpening 18yo on a 4-win streak vs a 36yo who faded to ITF after peaking.
Backing Barthel would mean trusting the outlier against consensus with NO exchange price
(book-priced small event = the losing backtest segment). Samson side offers no edge
(ML 64% < book-implied 65% at 1.53). No stakeable value. PASS.