Denis Istomin defeated Lukas Lacko 6-3 6-7 7-6 6-1 in the Australian Open round of 128 on hard. The upset overturned the form book — Lukas Lacko came in defending last year's round of 128. Denis Istomin extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-07-21 | Atlanta | R16 | hard | Lukas Lacko | 5-7 6-1 6-4 |
| 2013-07-22 | Atlanta | R32 | hard | Denis Istomin | 6-1 6-3 |
| 2010-08-22 | New Haven | R16 | hard | Denis Istomin | 6-2 2-6 6-3 |
| 2010-02-01 | Zagreb | R32 | hard | Lukas Lacko | 6-2 2-2 RET |
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