Jannik Sinner and Carlos Alcaraz survived US Open first round wobbles on Tuesday to stay on course for a semifinal showdown.
World number one Sinner fought back from a set and break down to defeat 140th-ranked Mackenzie McDonald in his first match since being embroiled in a doping test controversy.
Alcaraz, the third seed and 2022 champion in New York, overcame a second set blip to defeat 186th-ranked qualifier Li Tu of Australia 6-2, 4-6, 6-3, 6-1.
Italian Sinner battled to a 2-6, 6-2, 6-1, 6-2 win over American opponent McDonald on Arthur Ashe Stadium, racing away with 18 of the last 22 games.
The 23-year-old was returning to action just a week after it was revealed he had failed two drug tests in March.
However, he escaped a lengthy ban when officials decided he wasn’t at fault for the presence of banned anabolic agent clostebol in his system.
“The response from fans, I feel it has been great, also throughout when the news came out, in the practice sessions, there was a lot of support,” said Sinner.
“It’s still a little bit not easy. You have to go through day by day.”
Alcaraz, who won the first of his four Grand Slam titles in New York in 2022, opened the night session against Tu who hasn’t won a match on the main tour this year.
However, Tu thrilled the crowd as he went about his task of facing a player who is attempting to become only the third man in the modern era to win the French Open, Wimbledon and US Open in the same year.
After being outplayed in the opening set, Tu levelled the tie on a fifth set point in the second.
But Alcaraz crushed any hint of a shock result by running away with the clash to record his 15th successive Grand Slam match win.
“He surprised me a little bit. In the first set, he was nervous but after that he grew into it and played great tennis,” said the Spanish star.
Fifth-seeded Daniil Medvedev, who shattered Novak Djokovic’s dream of a calendar Grand Slam by claiming the 2021 US Open, went through with a four-set victory over Dujan Lajovic.
Stan Wawrinka, the 2016 champion, failed in his bid to become only the third man in last 50 years to win a main draw match at the tournament at the age of 39 or over.
Wawrinka slipped to a 6-4, 7-6 (7/5), 6-3 loss at the hands of Italian qualifier Mattia Bellucci.
Two former women’s champions were knocked out.
Bianca Andreescu, the 2019 winner, lost in three sets to sixth-seeded Jasmine Paolini while 2021 champion Emma Raducanu fell to 2020 Australian Open winner Sofia Kenin.
Britain’s Dan Evans defeated 23rd seed Karen Khachanov 6-7 (6/8), 7-6 (7/2), 7-6 (7/4), 4-6, 6-4 in the longest match in US Open history, a five-hour, 35-minute epic.