Krejčíková is a Grand Slam champion, having won the 2021 French Open singles title, the women's doubles titles at the 2018 French Open, 2018 Wimbledon and 2021 French Open and the mixed doubles titles at the Australian Open in 2019, 2020, and 2021. Krejčíková also won an Olympic gold medal in women's doubles alongside Kateřina Siniaková at the 2020 Tokyo Olympics. She is one of only four active female players to have won a Grand Slam title in all three different disciplines after Serena and Venus Williams and Samantha Stosur.