Players ATPWTA
| Name | Country |
|---|---|
| Romain Jouan | FRA |
| Javier Jover Maestre | ESP |
| Paul Jubb | GBR |
| Deivids Juksa | LAT |
| Woong-Sun Jun | KOR |
| Isade Juneau | CAN |
| Jason Jung | USA |
| Ki-Su Jung | KOR |
| Osni Junior | BRA |
| Andis Juska | LAT |
| Loic Juszczak | BEL |
| Vitaliy Kachanovskiy | RUS |
| Alibek Kachmazov | RUS |
| Kevin Kaczynski | GER |
| Nuttanon Kadchapanan | THA |
| Arjun Kadhe | IND |
| Karim Kadry | EGY |
| Chayanon Kaewsuto | THA |
| Jannis Kahlke | GER |
| Jacob Kahoun | SUI |
| Philipp Kahoun | SUI |
| Jessy Kalambay | SUI |
| Stephen Kaldawi | AUS |
| Danylo Kalenichenko | UKR |
| Niki Kaliyanda Poonacha | IND |
| Markos Kalovelonis | GRE |
| Tomas Kaluzik | CZE |
| Vadym Kalyuzhnyy | UKR |
| Ramy Kamal Aita | EGY |
| Tobias Kamke | GER |
| Dmitriy Kamynin | UKR |
| Jonathan Kanar | FRA |
| Byung-Kook Kang | KOR |
| Ho-Gi Kang | KOR |
| Ho-Min Kang | KOR |
| Ku Keon Kang | KOR |
| Vijay Kannan | IND |
| Ram Kapach | ISR |
| Andriej Kapas | POL |
| Charalampos Kapogiannis | GRE |
| Denis Kapric | GER |
| Reda Karakhi | MAR |
| Aslan Karatsev | RUS |
| Janicije Sasha Karic | USA |
| Djurabeck Karimov | UZB |
| Ivo Karlovic | CRO |
| Evgeny Karlovskiy | RUS |
| Austin Karosi | USA |
| Igor Karpov | RUS |
| Vladimir Karusevich | RUS |