Kei Nishikori defeated Ivo Karlovic 6-3 7-6 5-7 5-7 7-6 in the Australian Open round of 64 on hard. The upset overturned the form book — Ivo Karlovic came in defending last year's round of 32. Kei Nishikori extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-08-29 | US Open | R16 | hard | Kei Nishikori | 6-3 6-4 7-6(4) |
| 2014-02-10 | Memphis | F | hard | Kei Nishikori | 6-4 7-6(0) |
| 2013-02-25 | Delray Beach | R32 | hard | Ivo Karlovic | 5-4 RET |
| 2012-02-10 | Davis Cup WG R1: JPN vs CRO | RR | hard | Ivo Karlovic | 6-4 6-4 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 (161 vs 64). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About