Unlike the behemoths with a dominant serve, the 173cm Ferrer is reliant on his speed and agility to track down shots and win long rallies.
Succeeding with that style has become harder recently, with Ferrer's world ranking down to 37, and the Spaniard failing to get past the third round at any Grand Slam last year.
But despite slowing down, Ferrer's tenacity is still ever-present, and was on full display on centre court.
Against less relentless players the impressive Wu could have claimed the biggest win of his career, with only Ferrer's consistency denying the world number 314 a breakthrough victory.
Wu showed why tournament director Karl Budge deemed him worthy of a wildcard, with the junior US Open champion hitting some exquisite passing shots; his backhand a particular delight. But while Wu had the style, you also need the substance to beat Ferrer, and his qualities which have shone in Auckland since 2003 came to the fore.
Lengthy rallies are the veteran's trademark, with the first set taking 75 minutes to complete. Wu had a golden opportunity, up 6-4 in the tiebreak, but Ferrer - as he usually does - battled back to claim the set.
"Maybe I lost my focus, but this is tennis - until the last ball, you never know," philosophised Ferrer.
Age may have slowed him, but it's still hard to smack winners past him. Shots which would evade the racquet of most players are chased down, any mistakes get pounced on, and he'll grind opponents into committing unforced errors.
Wu found that out the hard way in the second set, receiving no easy points, and making mistakes at crucial times as Ferrer once again ground out a tiring triumph.
Wu received the standing ovation as he left the court, but Ferrer left with the victory - yet another win at the venue where he stands alone.
"It was very difficult, he is a young player but has very great power with his shots," analysed the Spaniard post-match.
"Maybe the key was my experience in the important moments."
He'll have to call on that experience in the second round against 2017 runner-up Joao Sousa.
"He is a good player, we will do a lot of rallies I think, so a very physical match.
"It will be a tough match."
These days, they all are for Ferrer, yet he still keeps racking up the wins.