- 3 9 ▁in ▁Singles ▁and ▁ 3 3 - 4 0 ▁in ▁Dou bles . ▁ ▁Professional ▁career ▁ ▁D ons ki ▁turned ▁professional ▁in ▁ 2 0 1 7 . The ▁same ▁year ▁D ons ki ▁finished ▁the ▁season ▁ranked ▁ 1 5 7 8 ▁in ▁the ▁ATP ▁Singles ▁rank ings . ▁ ▁By ▁the ▁end ▁of ▁ 2 0 1 8 ▁D ons ki ▁jump ed ▁ 1 4 7 ▁places ▁to ▁finish ▁the ▁ 2 0 1 8 ▁season ▁ranked ▁ 1 4 3 1 ▁in ▁the ▁ATP ▁Singles ▁rank ings ▁while ▁finishing ▁the ▁year ▁ranked ▁ 1 0 6 1 ▁in ▁the ▁ATP ▁Dou bles ▁Rank ings . ▁ ▁In ▁Singles , ▁his ▁break through ▁on ▁the ▁I TF ▁Fut ures ▁circuit ▁came ▁when ▁he ▁reached ▁the ▁final ▁of ▁the ▁Bulg aria ▁F 1 ▁Fut ures , ▁losing ▁in ▁a ▁narrow ▁three - set ▁match ▁against ▁Turkey ' s ▁Alt ug ▁ Ç el ik b ile k . ▁ ▁After ▁reaching ▁a ▁further ▁two ▁Fut ures ▁Singles ▁final s ▁D ons ki ▁finally ▁won ▁his ▁first ▁professional ▁singles ▁title ▁at ▁the ▁South ▁Africa ▁F 2 ▁Fut ures ▁be ating ▁France ' s ▁Arthur ▁C az aux ▁ 7 - 6 ( 3 ), ▁ 6 - 7 ( 5 ), ▁ 7 - 6 ( 6 ). ▁ ▁After ▁more ▁good ▁runs ▁in ▁Fut ures ▁tournament s , D ons ki ▁reached ▁a ▁Career ▁High ▁ATP ▁ranking ▁of ▁ 5 9 2 ▁in ▁Singles ▁on ▁ 1