| 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 | Right Handed |
| Admir Kalender | Croatia | Right Handed |
| Tobias Kamke | Germany | Right Handed |
| Aslan Karatsev | Russia | Right Handed |
| Ivo Karlovic | Croatia | Right Handed |
| Miomir Kecmanovic | Serbia | Right Handed |
| Karen Khachanov | Russia | Right Handed |
| Zane Khan | United States | Right Handed |
| Nicolas Kicker | Argentina | Right Handed |
| Evan King | United States | Left Handed |
| Kevin King | United States | Left Handed |
| Ergi Kirkin | Turkey | Right Handed |
| Raven Klaasen | South Africa | Right Handed |
| Bradley Klahn | United States | Left Handed |
| Lukas Klein | Slovakia | Right Handed |
| Martin Klizan | Slovakia | Left Handed |
| Julian Knowle | Austria | Left Handed |
| Dominik Koepfer | Germany | Left Handed |
| Philipp Kohlschreiber | Germany | Right Handed |
| Thanasi Kokkinakis | Australia | Right Handed |
| Zdenek Kolar | Czech Republic | Right Handed |
| Henri Kontinen | Finland | Right Handed |
| Wesley Koolhof | Netherlands | Right Handed |
| Vit Kopriva | Czech Republic | Right Handed |
| Sebastian Korda | United States | Right Handed |
| Pavel Kotov | Russia | Right Handed |
| Aleksandar Kovacevic | United States | Right Handed |
| Ostap Kovalenko | Russia | Right Handed |
| Jozef Kovalik | Slovakia | Right Handed |
| Stefan Kozlov | United States | Right Handed |
| Austin Krajicek | United States | Left Handed |
| Filip Krajinovic | Serbia | Right Handed |
| Kevin Krawietz | Germany | Right Handed |
| Pedja Krstin | Serbia | Right Handed |
| Mitchell Krueger | United States | Right Handed |
| Jason Kubler | Australia | Right Handed |
| Lukasz Kubot | Poland | Right Handed |
| Denis Kudla | United States | Right Handed |
| Nicola Kuhn | Spain | Right Handed |
| Mikhail Kukushkin | Kazakhstan | Right Handed |
| Dimitar Kuzmanov | Bulgaria | Right Handed |
| Andrey Kuznetsov | Russia | Right Handed |
| Bruno Kuzuhara | United States | Right Handed |
| Thai-Son Kwiatkowski | United States | Right Handed |
| Soon Woo Kwon | South Korea | Right Handed |
| Jerome Kym | Switzerland | Right Handed |
| Nick Kyrgios | Australia | Right Handed |
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