Australian tennis star Nick Kyrgios' assault case is set for mention in court on Tuesday.

Kyrgios was due to be before the ACT Magistrates Court three weeks ago but the hearing was postponed.

The 27-year-old will be represented by Canberra solicitor Michael Kukulies-Smith and won't appear in person as he remains in the United States to take part in the US Open, which begins on August 29.

The common assault charge relates to an incident in January 2021 that was reported to ACT police in December.

The charge reportedly relates to an incident with his ex-girlfriend Chiara Passar.

The case comes off the back of Kyrgios losing to Taylor Fritz at the Cincinnatti Open, failing to make the final 16.

© AAP 2022