After coming through his opening match with little fuss, the questions then turned to how Alcaraz would pull up physically two days later.
Sweeping aside 23-year-old Faria answered those emphatically, although Alcaraz knows the tests will get tougher if he is able to move further through the draw.
As well as the likelihood of facing opponents ranked much higher than Safiullin and Faria, it will be interesting to see how his body continues to react to playing more five-set matches in quick succession after such a long absence.
On whether he wished he had been quicker against Faria, Alcaraz said: “At the end, I realised that playing four sets was really good for me to test everything physically, to test my body, how I feel, and how I’m going to feel tomorrow after this match.”
With his fierce rival Jannik Sinner missing from New York through injury, and 24-time major champion Novak Djokovic already out, Alcaraz might increasingly fancy his chances of going all the way in a draw which looks to be wide open.
Alcaraz’s next challenge will be overcoming China’s Wu Yibing, who is ranked 113th in the world, in the last 32.
Meanwhile, American 20th seed Tommy Paul – a potential opponent for Alcaraz in the fourth round – continued his progress with a 6-2 6-3 5-7 6-4 victory over Croatia’s Dino Prizmic.
Paul goes on to face Kazakh 15th seed Alexander Bublik, who cruised past French veteran Adrian Mannarino in a 6-3 6-1 6-1 win.
Eighth seed Ben Shelton continued his own quest to become the first American men’s champion since Andy Roddick in 2003 with a 6-3 5-7 7-6 (7-3) 7-5 victory over Poland’s Hubert Hurkacz.
Two-time semi-finalist Frances Tiafoe, another home favourite, demonstrated his great form with a 6-3 7-6 (7-2) 7-5 win against Japan’s Rei Sakamoto, but Spanish 12th seed Rafael Jodar was the biggest casualty in the men’s draw on day four after losing 6-2 6-1 6-1 to Chinese world number 124 Bu Yunchaokete.
