New York - South Africa's Kevin Anderson outlasted Canadian teenager Denis Shapovalov to reach the US Open round of 16 on Friday.
In a match that lasted three hours and 43 minutes, the tall South African prevailed 4-6, 6-3, 6-4, 4-6, 6-4 as the roof on the new Louis Armstrong Stadium was closed for the first time.
"Felt like being in a coliseum. Constant noise going on the whole time," said Anderson after his second five-setter in three rounds.
The fifth seed, who lost last year's final to world No 1 Rafael Nadal, next faces ninth-seeded Austrian Dominic Thiem, who made the last 16 for the fourth time in five years with a 3-6, 6-3, 7-6 (7/5), 6-4 victory over American Taylor Fritz.
Thiem has now put together three wins in a row for the first time since finishing runner-up to Nadal at Roland Garros.