Taylor Fritz survived another three-set scare in order to book his place in the Stuttgart Open semi-finals with a win over Mattia Bellucci.

It was the second time in as many days that Fritz was pushed all the way and had to come from behind, but he prevailed 5-7 7-5 7-5 in just under two and a half hours.

The American attempted to pile the pressure on early, forcing five break points in the fourth game, but Bellucci got an important hold to level the score at 2-2.

That then set him on his way to getting the all-important break in the penultimate game of the set, though it took him three set points to take the lead.

There was little to split the pair again in the second, and Fritz almost gave himself a mountain to climb, but held off a break point to go 6-5 up before forcing a decider.

And it was not until the final game of the third set that the second seed got another break as he converted his second match point to reach the final four.

"I was happy to get through another one like that," Fritz said in his on-court interview.

"It was a pretty tough match, and I am really being tested in the first two matches here. I am super happy to get through.

"One of the most important parts of playing on grass is winning those big points and getting through those close matches, as there will be a lot of them on grass."

SF BOUND @boss__open | #BOSSOPEN | @Taylor_Fritz97 pic.twitter.com/QJZ5DzzZvQ

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Fritz will face Alexander Bublik for a place in the final after the third seed defeated Giovanni Mpetshi Perricard 7-6 (7-5) 7-6 (7-3), with neither player facing a break point in the match.

Jiri Lehecka also joins them in the semi-finals after a 6-4 7-6 (7-4) victory over Frances Tiafoe, but he will have to wait until Saturday to find out his opponent.

Ben Shelton and Sho Shimabukuro's quarter-final was suspended due to darkness, with the Japanese qualifier leading 6-4 after the first set.

Shelton had been looking to pull off double-duty after he beat Marcos Giron 6-7 (4-7) 6-4 7-6 (7-5) earlier in the day to reach the last eight, after his match on Thursday was also interrupted by the weather.

Fritz shows rallying spirit

Fritz's clay-court swing ended on a dour note as he made a first-round exit from the French Open, but he is looking to put that behind him on grass.

And while it has not been the strongest of starts, given he has twice fallen behind, he will still feel confident of claiming a sixth grass-court title this week - among active players, only Novak Djokovic (eight) can better that tally.

As he so often does, Fritz relied on his serve to get out of trouble, with 11 aces as well as making 71% of his first deliveries.

But he will face an even sterner test from Bublik, who also struck 11 aces in his win, and won 86% of his first-serve points (49/57).