He reached three tour-level finals in 2018 and won his first title at the Stockholm Open. With his runner-up finish at the Canadian Open, he became the youngest player to defeat four top ten opponents in a single tournament. Since culminating his season with an exhibition title at the Next Gen ATP Finals, Tsitsipas has become a fixture in the top 10 of the ATP rankings and reached two Grand Slam semifinals at the 2019 Australian Open and the 2020 French Open.