The second-round clash on Court One, which lasted three hours 12 minutes, was suspended on Thursday evening in fading light with the 20-year-old American Fritz leading 2-1 after taking a 56-minute third set.
Gulbis has had an incredible tournament, with all three of his matches so far going to five sets after he qualified into the main draw.
It was the fourth time in six Grand Slam matches that the 21-year-old German has come back from 2-1 down to win five-setters, after three at the French Open.
"Yesterday was tough for several reasons, I had a stomach virus, went to bathroom at the end of the second set and threw up, and last night I didn't eat anything", he said. Of course, today I found a way better than he did.
"I just came out with a very different mindset", said Raonic. "I was seeing the ball much better".
'I saw that he was getting exhausted in the fifth set, ' the Latvian said in his post-match conference.
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Fritz, ranked 68th, has strong tennis genes as his mother Kathy reached the Wimbledon last 16 in 1977.
But with it all to play for in the decider, Zverev crumbled and did not win a single game as Gulbis clinched an impressive victory to move into the second week at the All England Club.
German fourth seed Alexander Zverev wilted in 33-degree heat and crashed out in the third round on Saturday.
Top seed and defending champion Roger Federer continued his serene run at Wimbledon as he strolled into the last 16 with 6-3 7-5 6-2 win over Germany's Jan-Lennard Struff on Friday. "I'm not having any pain so I am able to hit the two-handed backhand more often, which is good for my whole game", he said. It's just what it is.
With everything on the line, de Minaur forced Nadal into longer rallies, giving one of the trademark performances that have distinguished him as a promising young player. "It's a good court, but. of course, bigger courts are nicer".
He will go into his match against qualifier Ernests Gulbis as the favourite, but Gulbis has already demonstrated a penchant for pulling off upsets at this year's Championships. "Obviously she's so aggressive, so if I would keep letting her play, I would lose anyway", she said of her approach that saw her finish with 29 winners against 22 unforced errors.