World number one Iga Swiatek was in tears on the court after losing to Jessica Pegula at the United Cup in Sydney.
Asked in a press conference for the reason behind her show of emotion, Swiatek said: “Because I just knew that I felt kind of helpless today, because physically and mentally I wasn’t able to kind of show up even, and problem-solve.
“So it’s always hard when you lose, especially when you’re playing for the team and your country. So I was just sad. But it’s not the first time I cried after a lost match. Nothing special.”
The United States took a 2-0 lead after Frances Tiafoe defeated Kacper Zuk 6-3 6-3 and need only one victory from three matches on Saturday to reach the final.
Trevisan celebrated a 6-3 6-7 (4) 7-5 victory after three hours and 15 minutes, upsetting a player ranked 21 places higher.
Greece are heavily dependent on Sakkari and Stefanos Tsitsipas, and Italy eased into a 2-0 lead, with Lorenzo Musetti defeating Stefanos Sakellaridis 6-1 6-1.