| Challenger Ismaning | 11/04 13:15 | 28 | [179] Lukas Klein v Maximilian Marterer [105] | 4-6,4-6 | |
| Challenger Ismaning | 11/03 16:25 | 27 | Lukas Klein v Max Hans Rehberg | 6-3,6-2 | |
| Challenger Ismaning | 11/02 14:15 | 26 | [179] Lukas Klein v Nerman Fatic [226] | 6-7,6-4,6-4 | |
| Challenger Ismaning | 11/01 12:40 | 25 | [150] Damir Dzumhur v Lukas Klein [179] | 3-6,6-3,1-6 | |
| Challenger Ortisei | 10/29 10:00 | 29 | [181] Lukas Klein v Maks Kasnikowski [310] | 6-7,7-6,7-6 | |
| Challenger Ortisei | 10/28 11:00 | 28 | [181] Lukas Klein v Billy Harris [249] | 6-3,7-6 | |
| Challenger Ortisei | 10/27 12:55 | 27 | [314] Enrico Dalla Valle v Lukas Klein [181] | 3-6,2-6 | |
| Challenger Ortisei | 10/26 09:30 | 26 | Lukas Klein v Mirza Basic | 7-6,7-6 | |
| Challenger Ortisei | 10/24 10:25 | 25 | [324] Andrew Paulson v Lukas Klein [181] | 5-7,4-6 | |
| Challenger Ortisei | 10/23 08:00 | 19 | [181] Lukas Klein v Andrea Picchione [377] | 7-6,4-6,6-2 | |
| Challenger Ortisei | 10/22 09:20 | 14 | Lukas Klein v Federico Arnaboldi | 6-1,4-6,6-3 | |
| Challenger Bratislava | 10/13 15:15 | 27 | [164] Gabriel Diallo v Lukas Klein [149] | 3-6,7-6,6-2 | |
| Challenger Bratislava | 10/12 12:30 | 26 | [149] Lukas Klein v Otto Virtanen [118] | 6-4,6-4 | |
| Challenger Bratislava | 10/10 13:30 | 25 | [168] Dino Prizmic v Lukas Klein [149] | 0-6,3-6 | |
| Alicante, Spain | 10/04 11:25 | 26 | [150] Lukas Klein v Maximilian Marterer [126] | 3-6,5-7 | |
| Alicante, Spain | 10/03 09:00 | 25 | [150] Lukas Klein v Daniel Cox [428] | 6-3,6-2 | |
| Challenger St. Tropez | 09/22 08:30 | 26 | [151] Lukas Klein v Liam Broady [103] | 2-6,2-6 | |
| Challenger St. Tropez | 09/19 15:25 | 25 | [151] Lukas Klein v Jules Marie [240] | 4-6,6-3,6-3 | |
| Coupe Davis | 09/17 14:25 | 5 | Alexandros Skorilas v Lukas Klein | Cancelled | |
| Coupe Davis | 09/16 09:40 | 2 | [5] Stefanos Tsitsipas v Lukas Klein [149] | Retired | |
| Istanbul, Turkey | 09/10 12:00 | 29 | [211] Damir Dzumhur v Lukas Klein [155] | 7-6,6-3 | |
| Istanbul, Turkey | 09/09 08:00 | 28 | [155] Lukas Klein v Jesper De Jong [141] | 7-6,6-7,7-6 | |
| Istanbul, Turkey | 09/08 07:30 | 27 | [271] Denis Yevseyev v Lukas Klein [155] | 6-7,7-6,6-7 | |
| Istanbul, Turkey | 09/06 09:00 | 26 | [368] Ergi Kirkin v Lukas Klein [155] | 3-6,4-6 | |
| Istanbul, Turkey | 09/05 07:00 | 25 | [399] Martin Damm v Lukas Klein [155] | 4-6,6-4,5-7 | |
| US Open, New York, USA | 08/26 18:15 | 19 | [98] Hugo Gaston v Lukas Klein [156] | 1-6,6-3,6-1 | |
| US Open, New York, USA | 08/24 16:55 | 15 | [156] Lukas Klein v Maximilian Marterer [129] | 7-6,6-2 | |
| US Open, New York, USA | 08/23 16:50 | 14 | [156] Lukas Klein v Mariano Navone [181] | 6-1,6-2 | |
| Challenger Liberec | 08/03 09:35 | 26 | [251] Dino Prizmic v Lukas Klein [151] | 6-2,7-6 | |
| Challenger Liberec | 07/31 12:10 | 25 | [286] Joao Lucas Reis da Silva v Lukas Klein [151] | 1-6,2-6 |
Wikipedia - Lukáš Klein
Lukáš Klein, né le à Spišská Nová Ves, est un joueur de tennis slovaque, professionnel depuis 2016.