The round of 16 in the Belgrade tournament began with surprise, as the Argentine Federico Delbonis, number 84 of the world ranking, defeated in a closely contested match against the Serbian Dusan Lajovic, fourth favorite, by 6-3, 2-6 and 6-4.
For his part, the Italian Gianluca Mager beat the Australian Alexei Popyrin (7-5 and 6-2) and will face the Russian Alan Karatsev, who beat Slovenian Aljaz Bedene in three sets in a duel resolved in the tiebreaker of the third set of the closing clash of the day (6-3, 4-6 and 7-6 (5)).
Japanese Taro Daniel beat Australian John Millman, seeded number seven, by 6-3, 2-6 and 3-6 in a match that lasted more than two hours and will face Argentine Federico Delbonis in the quarterfinals.
Results, tables and calendar.