| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|
| K |
| Name | Country | Plays |
| Alibek Kachmazov | Russia | Right Handed |
| Arjun Kadhe | India | |
| Admir Kalender | Croatia | |
| Danylo Kalenichenko | Ukraine | Right Handed |
| Markos Kalovelonis | Greece | |
| Tobias Kamke | Germany | Right Handed |
| Aslan Karatsev | Russia | Right Handed |
| Ivo Karlovic | Croatia | Right Handed |
| Evgeny Karlovskiy | Russia | Right Handed |
| Blaz Kavcic | Slovenia | Right Handed |
| Miomir Kecmanovic | Serbia | Right Handed |
| Dayne Kelly | Australia | Right Handed |
| Mariano Kestelboim | Argentina | |
| Timur Khabibulin | Kazakhstan | |
| Karen Khachanov | Russia | Right Handed |
| Zane Khan | USA | Right Handed |
| Nicolas Kicker | Argentina | Right Handed |
| Cheong-Eui Kim | Korea Republic | |
| Kevin King | USA | Left Handed |
| Darian King | Barbados | Right Handed |
| Evan King | USA | |
| Strong Kirchheimer | USA | |
| Koray Kirci | Turkiye | |
| Ergi Kirkin | Turkiye | Right Handed |
| Vasil Kirkov | USA | Right Handed |
| Raven Klaasen | South Africa | |
| Bradley Klahn | USA | Left Handed |
| Lukas Klein | Slovakia | Right Handed |
| Martin Klizan | Slovakia | Left Handed |
| Julian Knowle | Austria | |
| Toby Alex Kodat | USA | |
| Dominik Koepfer | Germany | Left Handed |
| Philipp Kohlschreiber | Germany | Right Handed |
| Thanasi Kokkinakis | Australia | Right Handed |
| Zdenek Kolar | Czech Republic | Right Handed |
| Henri Kontinen | Finland | |
| Wesley Koolhof | Netherlands | |
| Vit Kopriva | Czech Republic | Right Handed |
| Sebastian Korda | USA | Right Handed |
| Pavel Kotov | Russia | Right Handed |
| Aleksandar Kovacevic | USA | Right Handed |
| Jozef Kovalik | Slovakia | Right Handed |
| Stefan Kozlov | USA | Right Handed |
| Austin Krajicek | USA | |
| Filip Krajinovic | Serbia | Right Handed |
| Liam Krall | USA | Right Handed |
| Georgii Kravchenko | Ukraine | Right Handed |
| Konstantin Kravchuk | Russia | |
| Kevin Krawietz | Germany | |
| Pedja Krstin | Serbia | Right Handed |
| Mitchell Krueger | USA | Right Handed |
| Oleksii Krutykh | Ukraine | Right Handed |
| Marc Othman Ktiri | Spain | Right Handed |
| Jason Kubler | Australia | Right Handed |
| Lukasz Kubot | Poland | |
| Denis Kudla | USA | Right Handed |
| Nicola Kuhn | Germany | Right Handed |
| Mikhail Kukushkin | Kazakhstan | Right Handed |
| Pranav Kumar | USA | Right Handed |
| Dimitar Kuzmanov | Bulgaria | Right Handed |
| Andrey Kuznetsov | Russia | Right Handed |
| Bruno Kuzuhara | USA | Right Handed |
| Thai-Son Kwiatkowski | USA | Right Handed |
| SoonWoo Kwon | Korea Republic | Right Handed |
| Jerome Kym | Switzerland | |
| Patrick Kypson | USA | Right Handed |
| Nick Kyrgios | Australia | Right Handed |
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