[2] In July 2018, Gerasimov recorded his first ATP match victory on the hard courts of Los Cabos, defeating Bernard Tomic 6-4 6–3.

He also beat the experienced big server Sam Querrey before facing defeat against world No.

[2] At the 2019 US Open, Gerasimov won his first Grand Slam match, defeating Lloyd Harris 7-5 7-6 7-6, having progressed through the qualifying rounds.

1 Andy Murray in straight sets, Aljaž Bedene and Alejandro Davidovich Fokina before losing to eventual champion David Goffin in the semifinals.

[2] He won his first ATP match for the season and since April 2022, defeating Bernabe Zapata Miralles and moved back a couple of positions shy of the top 500.

[4][3] Next he reached the semifinals at the 2023 Shenzhen Longhua Open defeating Kazakh Beibit Zhukayev and moved more than 100 positions into the top 400.

[3] He also qualified for the next new tournament in China, the 2023 Shenzhen Luohu Challenger and defeated seventh seed Denis Yevseyev.