Daniel Kosakowski defeated Jason Jung 4-6 6-1 6-4 in the USA F24 qualifying round on hard. The upset overturned the form book — Jason Jung came in leading the head-to-head 2–0. Daniel Kosakowski claimed a first win over Jason Jung in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-03-18 | USA F8 | R32 | hard | Jason Jung | 6-1 6-1 |
| 2013-03-11 | USA F7 | R32 | hard | Jason Jung | 5-7 6-3 6-2 |
Averages over each player's completed matches in the selected window (22 vs 200). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About