Alex Blumenberg defeated Charles Costa 6-4 6-3 in the Brazil F29 round of 32 on clay. The upset overturned the form book — Charles Costa came in leading the head-to-head 2–1. Alex Blumenberg narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-11-05 | Brazil F33 | R32 | clay | Charles Costa | 6-4 6-2 |
| 2010-12-13 | Brazil F37 | R32 | clay | Alex Blumenberg | 6-4 6-2 |
| 2010-07-26 | Brazil F17 | R32 | clay | Charles Costa | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.