Peter Heller defeated Jonas Luetjen 2-6 7-5 6-3 in the Poland F1 round of 32 on clay. The upset overturned the form book — Jonas Luetjen came in leading the head-to-head 1–0. Peter Heller claimed a first win over Jonas Luetjen in two meetings, levelling the head-to-head at 1–1.
Heller P. came through in three sets.
Clay: Heller P. leads 1–0 · Hard: Luetjen J. leads 1–0
Peter Heller beat Jonas Luetjen 2-6 7-5 6-3. Umpiry, "Peter Heller vs Jonas Luetjen — Poland F1 Round of 32", https://umpiry.com/match/2017-06-12/heller-vs-luetjen-poland-f1-r32?utm_source=cite (as of 12 June 2017).