ATP Players |
| 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 | Handedness | |
| Tobias Kamke | Germany | Right Handed | |
| Aslan Karatsev | Russia | Right Handed | |
| Ivo Karlovic | Croatia | Right Handed | |
| Christopher Kas | Germany | Right Handed | |
| Blaz Kavcic | Slovenia | Right Handed | |
| Robert Kendrick | United States | Right Handed | |
| Robin Kern | Germany | Right Handed | |
| Jordan Kerr | Australia | Right Handed | |
| Karen Khachanov | Russia | Right Handed | |
| Hicham Khaddari | Morocco | Right Handed | |
| Kevin King | United States | Left Handed | |
| Daniel King-Turner | New Zealand | Right Handed | |
| Raven Klaasen | South Africa | Right Handed | |
| Bradley Klahn | United States | Left Handed | |
| Ivo Klec | Germany | Right Handed | |
| Martin Klizan | Slovakia | Left Handed | |
| Bastian Knittel | Germany | Left Handed | |
| Julian Knowle | Austria | Left Handed | |
| Mark Knowles | Bahamas | Right Handed | |
| Michael Kohlmann | Germany | Right Handed | |
| Philipp Kohlschreiber | Germany | Right Handed | |
| Thanasi Kokkinakis | Australia | Right Handed | |
| Krasimir Kolev | United States | Right Handed | |
| Micke Kontinen | Finland | Right Handed | |
| Wesley Koolhof | Netherlands | Right Handed | |
| Evgeny Korolev | Kazakhstan | Right Handed | |
| Daniel Kosakowski | United States | Right Handed | |
| Mateusz Kowalczyk | Poland | Right Handed | |
| Stefan Kozlov | United States | Right Handed | |
| Austin Krajicek | United States | Left Handed | |
| Filip Krajinovic | Serbia | Right Handed | |
| Konstantin Kravchuk | Russia | Right Handed | |
| Kevin Krawietz | Germany | Right Handed | |
| Gero Kretschmer | Germany | Right Handed | |
| Pedja Krstin | Serbia | Right Handed | |
| Mitchell Krueger | United States | Right Handed | |
| Lukasz Kubot | Poland | Right Handed | |
| Denis Kudla | United States | Right Handed | |
| Alexander Kudryavtsev | Russia | Right Handed | |
| Mikhail Kukushkin | Kazakhstan | Right Handed | |
| Andrey Kumantsov | Russia | ||
| Igor Kunitsyn | Russia | Right Handed | |
| Dimitar Kutrovsky | Bulgaria | Right Handed | |
| Alex Kuznetsov | United States | Right Handed | |
| Andrey Kuznetsov | Russia | Right Handed | |
| Nick Kyrgios | Australia | Right Handed | |
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