He also qualified and reached his third quarterfinal for 2021 at the 2021 Eastbourne International defeating Alexei Popyrin. At a career high of World No. 79 achieved on 28 June 2021, on his debut in the main draw of the 2021 Wimbledon Championships, Ivashka reached the fourth round of a Grand Slam for the first time in his career defeating Jordan Thompson in straight sets, having never passed the second round of a major previously.[6] He lost to eventual finalist, seventh seed Matteo Berrettini.