The 21-year-old exhibited his big-point prowess again on Wednesday, upsetting top seed and No. 10 John Isner 7-6 (3), 7-6 (5) at the ASB Classic for his second Top 10 win.
"I really wanted to get the win on him, and I knew I could".
"It feels great", Fritz said.
He will face 50th-ranked Taylor Fritz in the last eight after the American stunned top seed John Isner.
Both players traded a single break in the first set, but Fritz had the edge immediately in the shortened format. He played calm and clean in the tie-breaks, converting his second match point when Isner lifted a backhand long.
Meanwhile, five-time champion David Ferrer's final appearance at the ASB Classic ended in unfortunate circumstances when he was forced to quit his second-round clash against Pablo Carreno-Busta with a calf injury.
"We had a lot of close points".
However, Isner was able to get the break back in the next game and surprise, surprise the set went to a tiebreak.
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Fritz gained a mini break at 4-1, before two consecutive aces brought Isner back into contention at 4-4. Isner battled back with two aces but couldn't disrupt Fritz's serve - he served 12 aces of his own - and the younger American took the set in 53 minutes.
Taylor Fritz has one of the best records on the circuit in tiebreaks.
Taylor grabbed the first advantage after a short backhand cross court victor in the third point but Isner pulled it back with a strong forehand attack in the eighth point for a 4-4. Fritz again took the early advantage, gaining a mini break on the third point and serving for a 4-1 lead.
Britain's Cameron Norrie beat Joao Sousa of Portugal 7-6 (7/5), 6-4 and Argentinian Leonardo Meyer came from behind to down Italy's Matteo Berrettini 5-7, 7-6 (7/5), 6-3.
"I like to think that one of my strengths is playing under pressure and playing the big moments well", Fritz added.
David tried to play but he made a decision to retire after he barely managed to move, receiving the special present in the post-match presentation after being one of the most successful players here, winning 32 matches in Auckland after the first appearance in 2003.
Elsewhere, Germany's Philipp Kohlschreiber defeated Ugo Humbert of France 6-4, 6-4 to set up a quarter-final against Fognini.
After receiving medical attention, he returned to the court to play one more point before withdrawing.
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