World quantity two Alcaraz was enjoying China’s Wu, who belied his rating of 560.
Each gamers produced blistering groundstrokes in a high-quality first set which Wu began strongly.
He had the assist of the house crowd and hit some eye-catching photographs, particularly off his backhand.
Nonetheless, his serve got here beneath the better stress, and whereas he managed to get to a tie-break he misplaced it to go a set down.
Within the second set, Wu thought he had saved a break level within the sixth recreation just for his first serve to be deemed out after an Alcaraz evaluation.
The Spaniard then gained the purpose to register the primary break of the match and go 4-2 up, earlier than happening to serve out the match.
“He is recovering his stage. He is getting back from harm so his stage deserves to be on the prime for positive,” stated Alcaraz.
“If he’s nonetheless enjoying at this stage and retains going then I will see him round extra typically.
“I am actually completely happy to get by way of. I am not used to the way in which I felt on court docket. He is a extremely highly effective participant and performed robust. I felt like I used to be not dominating the sport.”
Daniil Medvedev additionally made it by way of, battling to a 5-7 6-4 6-4 victory towards Matteo Arnaldi in two hours 44 minutes.
Medvedev achieved the decisive break within the ninth recreation of the deciding set earlier than happening to serve out for the match and can play both Stefanos Tsitsipas or Alexandre Muller within the final 16.
“It was a really robust match, a really shut one,” stated Medvedev. “I really felt like that is the place tennis is humorous. I felt like within the first set, I used to be in all probability the higher participant, had extra alternatives. I didn’t handle to [win] it, performed a nasty recreation on the finish of the set.
“Within the different units, I assumed it was nearer, possibly even he had the sting on among the moments. However, that is why tennis is loopy, you’ll be able to win when you do not anticipate it, and lose while you anticipate to win, so I’m completely happy to be right here once more in two days.”
Play was cancelled on the surface courts for the second day operating due to the rain, with matches solely potential beneath the roof of the principle stadium present court docket.
