Dmitry Popko defeated Danylo Kalenichenko 6-4 6-4 in the Slovakia F4 round of 16 on clay. The upset overturned the form book — Danylo Kalenichenko came in leading the head-to-head 1–0. Dmitry Popko claimed a first win over Danylo Kalenichenko in two meetings, levelling the head-to-head at 1–1.
Popko D. took it in straight sets.
Dmitry Popko beat Danylo Kalenichenko 6-4 6-4. Umpiry, "Dmitry Popko vs Danylo Kalenichenko — Slovakia F4 Round of 16", https://umpiry.com/match/2015-08-03/kalenichenko-vs-popko-slovakia-f4-r16?utm_source=cite (as of 3 August 2015).