Martin Fischer defeated Frederik Nielsen 6-3 6-2 in the Dusseldorf qualifying round of 32 on clay. The upset overturned the form book — Frederik Nielsen came in leading the head-to-head 1–0. Martin Fischer claimed a first win over Frederik Nielsen in two meetings, levelling the head-to-head at 1–1.
Fischer M. took it in straight sets.
Clay: Fischer M. leads 1–0 · Grass: Nielsen F. leads 1–0
Martin Fischer beat Frederik Nielsen 6-3 6-2. Umpiry, "Martin Fischer vs Frederik Nielsen — Dusseldorf Qualifying Round of 32", https://umpiry.com/match/2013-05-18/fischer-vs-nielsen-dusseldorf-q32?utm_source=cite (as of 18 May 2013).