The last American man standing at the Australian Open is through to the quarterfinals.
Tennys Sandgren, who had never won a Grand Slam match or beaten a top 10 player before the Australian Open started, upset No. 5-seeded Dominic Thiem on Monday to top his second-round victory over 2014 champion Stan Wawrinka.
The 26-year-old Sandgren, who entered the season's opening major ranked 97th, missed a match point in the fourth set but held on for a 6-2, 4-6, 7-6 (4), 6-7 (7), 6-3 win over Thiem.
"I'm staying calm and not getting too upset, not getting too up, not getting too down," Sandgren said when asked how a player with only two ATP tour match victories kept...