Bastian Knittel defeated Nils Langer 6-2 6-1 in the Germany F4 semi-final on carpet. The result followed the form book — Bastian Knittel came in leading the head-to-head 1–0. Bastian Knittel extended the head-to-head to 2–0.
Knittel B. took it in straight sets.
Carpet: Knittel B. leads 1–0 · Clay: Knittel B. leads 1–0
Bastian Knittel beat Nils Langer 6-2 6-1. Umpiry, "Bastian Knittel vs Nils Langer — Germany F4 Semi-final", https://umpiry.com/match/2013-01-28/knittel-vs-langer-germany-f4-sf?utm_source=cite (as of 28 January 2013).