UPSET ALERT: Jiri Lehecka pulls off three-set comeback to knock out No. 1 seed Carlos Alcaraz in Doha
Not only did the Czech have to come back from one set down, but also a 2-4 scoreboard deep in the deciding set.
The 17-year-old revealed the secret to her mental toughness after stunning world No. 2 Iga Swiatek in Dubai.