

Mona Barthel defeated Donna Vekic 3-6 6-4 6-2 in the Australian Open round of 128 on hard. The upset overturned the form book — Donna Vekic came in ranked #35, defending last year's round of 128. Mona Barthel extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-06-11 | Nottingham | QF | grass | Donna Vekic | 7-5 6-1 |
| 2018-04-09 | Lugano | R16 | clay | Mona Barthel | 6-3 4-6 6-4 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About
Averages over each player's completed matches in the selected window (199 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Barthel M.: 6 days rest · 1 match, 18 games (7d) · Vekic D.: 13 days rest · 1 match (14d). Higher means fresher. About