Katie Ruckert defeated Mariana Duque Marino 6-3 6-2 in the Obregon 10K qualifying round on hard. The upset overturned the form book — Mariana Duque Marino came in leading the head-to-head 1–0. Katie Ruckert claimed a first win over Mariana Duque Marino in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-29 | Leon 10K | QF | hard | Mariana Duque Marino | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.