19 Sep 2021 to 26 Sep 2021ATP Challenger, Biel, Switzerland2021 ATP Challenger Biel, Switzerland Men Singlesplayer-tournament-eliminated-textroundopponentsstatusscorequalificationHiroki MoriyaLost6 - 3 6 - 4
17 Jul 2021 to 25 Jul 2021Swiss Open Gstaad2021 ATP Gstaad, Switzerland Men Singlesplayer-tournament-eliminated-textmore-detailsfewer-detailsroundopponentsstatusscoreround_of_32Marc PolmansLost7 - 5 6 - 3qualificationKacper ZukWon6 - 2 4 - 6 2 - 6qualificationErnests GulbisWon6 - 3 6 - 4
04 Jul 2021 to 11 Jul 2021ATP Challenger Braunschweig, Germany2021 ATP Challenger Braunschweig, Germany Men Singlesplayer-tournament-eliminated-textmore-detailsfewer-detailsroundopponentsstatusscoreround_of_16Benjamin HassanLost6 - 4 3 - 6 4 - 6round_of_32Mats MoraingWon6 - 7 6 - 4 6 - 4qualificationNino EhrenschneiderWon4 - 6 7 - 6 1 - 6qualificationAziz DougazWon1 - 6 6 - 3 6 - 1