Ivo Karlovic defeated Kei Nishikori 6-4 6-4 6-3 in the JPN vs CRO round robin on hard.
Karlovic I. took it in straight sets.
Karlovic I. and Nishikori K. faced 4 of the same opponents in the last 12 months. Karlovic I. went 2–2 (50%) against them, Nishikori K. 1–3 (25%). Results against comparable opponents are close (2 : 1 better-results split).
Only 4 common opponents — small sample, treat as indicative.
Ivo Karlovic beat Kei Nishikori 6-4 6-4 6-3. Umpiry, "Ivo Karlovic vs Kei Nishikori — JPN vs CRO Round Robin", https://umpiry.com/match/2012-02-10/karlovic-vs-nishikori-jpn-vs-cro-rr?utm_source=cite (as of 10 February 2012).