The semifinals lineup of the Next Gen ATP Finals have been confirmed after a dramatic day of action in Milan.
Three of Thursday's four matches went the full five sets as the final four advanced to the Friday's semis.
Group A winner Hyeon Chung stayed perfect with a 1-4, 4-1, 4-2, 3-4 (6), 4-3 (3) triumph over home favourite Gianluigi Quinzi.
In Group B, Borna Coric had already qualified but ended Karen Khachanov's chances with a 3-4 (3), 2-4, 4-2, 4-0, 4-2 win in their encounter. As a result, Daniil Medvedev goes through following his 3-4 (3), 4-2, 4-3 (1), 4-0 win against American Jared Donaldson on Court Centrale.