Tien is the primary 19-year-old American to achieve the fourth spherical on the Australian Open since 14-time Grand Slam winner Pete Sampras in 1990.
He’s certainly one of a trio of youngsters who’ve impressed with wins over top-10 gamers in Melbourne.
Brazil’s Joao Fonseca, 18, shocked Russian Andrey Rublev within the first spherical, then 19-year-old Czech Jakub Mensik knocked out Norway’s Casper Ruud within the second spherical.
However whereas each Fonseca and Mensik have fallen, Tien has superior to arrange a gathering with Italy’s Lorenzo Sonego.
“It feels nice, clearly,” mentioned Tien.
“This has exceeded my expectations, what I hoped for coming into this week.
“You go into each match believing you possibly can win, however to be within the second week is wonderful.”
In the meantime Monfils, a showman and a crowd favorite, continued his wealthy vein of latest kind.
His win over 27-year-old Fritz follows victory on the ASB Traditional in Auckland earlier this month, when he turned the oldest winner of an ATP Tour singles title.
After serving an ace – his twenty fourth of the match – to see out victory, Monfils danced in celebration earlier than pumping his chest and roaring to the stands.
“I’ve a powerful perception I can nonetheless do some harm,” Monfils mentioned.
“He began robust however I felt I might transfer nice at this time.”
Monfils’ victory got here earlier than his spouse Elina Svitolina received her third-round tie in opposition to Jasmine Paolini on the identical court docket.
“I feel I warmed up the court docket for her,” Monfils joked.
“She performs the world quantity 4 so it will likely be robust for her however I hope she is going to smash this one.”
Monfils will play American twenty first seed Ben Shelton after he beat Italy’s Lorenzo Musetti 6-3 3-6 6-4 7-6 (7-5).
