Kirchheimer made his ATP main draw debut at the
2023 Winston-Salem Open after entering the singles main draw as a lucky loser directly into the second round after the withdrawal of 11th seed
Daniel Altmaier. For a second year in a row, ranked No. 495, he entered the main draw of the
2024 Winston-Salem Open after qualifying as an alternate, with wins over another alternate player Ryan Fishback and sixth qualifying seed
Thai-Son Kwiatkowski. ==College career==