Rankings, career records and tournament history for the ATP field, plus the head to head between any two of them.
| Rank | Player | Country |
|---|---|---|
| 27 | Karen Khachanov | Russia |
| 61 | Miomir Kecmanovic | Serbia |
| 68 | Vit Kopriva | Czech Republic |
| 74 | Sebastian Korda | United States |
| 81 | Aleksandar Kovacevic | United States |
| 118 | Patrick Kypson | United States |
| 150 | Thanasi Kokkinakis | Australia |
| 161 | Soonwoo Kwon | South Korea |
| 178 | Jerome Kym | Switzerland |
| 187 | Pavel Kotov | Neutral |
| 194 | Moise Kouame | France |
| 196 | Zdenek Kolar | Czech Republic |
| 203 | Jason Kubler | Australia |
| 278 | Martin Krumich | Czech Republic |
| 386 | Jack Kennedy | United States |
| 741 | Nick Kyrgios | Australia |
