Guillermo Garcia Lopez defeated Juan Monaco 3-6 1-6 6-4 7-6 7-6 in the US Open round of 128 on hard. The upset overturned the form book — Juan Monaco came in leading the head-to-head 7–1, defending last year's round of 16. Guillermo Garcia Lopez narrowed the head-to-head to 7–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-03-25 | Miami Masters | R32 | hard | Juan Monaco | 7-5 6-4 |
| 2014-07-21 | Gstaad | R16 | clay | Juan Monaco | 6-2 2-6 6-4 |
| 2013-07-22 | Gstaad | R16 | clay | Juan Monaco | 6-1 6-2 |
| 2012-07-09 | Stuttgart | SF | grass | Juan Monaco | 6-3 3-6 7-5 |
| 2010-03-11 | Indian Wells Masters | R16 | hard | Juan Monaco | 3-6 6-2 6-1 |
| 2009-10-05 | Tokyo | R32 | hard | Juan Monaco | 5-0 RET |
| 2008-04-14 | Valencia | R16 | hard | Juan Monaco | 6-4 6-4 |
| 2005-02-14 | Costa Do Sauipe | R32 | hard | Guillermo Garcia Lopez | 6-1 6-3 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About