MELBOURNE, Australia — Ben Shelton’s Australian Open quarterfinal foe, Lorenzo Sonego, produced the shot of the tournament — diving to his left for a volley with so much spin that the ball bounced on one side of the net, then floated back over to the other — but it was the American who ended up with the victory Wednesday.

The left-handed Shelton did some entertaining of his own, including earning cheers by doing a couple of push-ups after tumbling in the concluding tiebreaker, and he reached his second Grand Slam semifinal at age 22 by beating the unseeded Sonego 6-4, 7-5, 4-6, 7-6 (4).

“I’m relieved,” said Shelton, who will meet No. 1 Jannik Sinner of Italy on Friday for a spot in the final. “Shout out Lorenzo Sonego because that was some ridiculous tennis.”

Sinner, the defending champion at Melbourne Park, completely overwhelmed the last Australian in the men’s bracket, No. 8 Alex de Minaur, 6-3, 6-2, 6-1 at night.

“It’s been too many times playing him and seeing the same thing. So I’m not even surprised anymore when I face him,” said de Minaur, who is now 0-10 against Sinner over their careers. “Matches like these happen.”

Sinner looked and played much better than he did — hand trembling, head dizzy — during a four-set struggle against Holger Rune in the fourth round. After giving himself a bit of a break on Tuesday, sleeping in and only hitting on court for about 30 or 40 minutes, Sinner said his body was much better.

“For sure, was (my) best match of the tournament so far,” said Sinner, who stretched his unbeaten winning streak to 19 matches dating back to last season.

Shelton, who is seeded 21st, closed the first set against Sonego with a 144 mph (232 kph) ace, tied for the fastest serve over the past 1 1/2 weeks, and flexed his left arm after smacking a powerful forehand to close a 22-stroke point and earn a break in the second. His father Bryan, a former tour pro who is Ben’s coach, grinned, too, while patting his own right biceps.

A few points from the end, Shelton sprinted to get his racket on a seemingly unreachable ball, and fell into a courtside advertising board as Sonego hit an easy winner to take the point.

Shelton stayed on the ground for a bit, then earned applause for his effort — and post-fall calisthenics.

When Shelton closed things with a 26th forehand winner — he had zero via backhands — he flexed again and sneered until his expression morphed into a smile.

The women’s semifinals today are No. 1 Aryna Sabalenka, the tournament winner in each of the last two years, against No. 11 Paula Badosa, and No. 2 Iga Swiatek against No. 19 Madison Keys.