Coco Gauff has stormed her way into the U.S. Open semifinals with a dominant run that’s impressed everybody other than the woman she dominated.

On a blistering Tuesday afternoon in Arthur Ashe Stadium, Gauff was even hotter in a 6-0, 6-2 quarterfinal mismatch against Jelena Ostapenko.

“Yeah, [it] was the best match I’ve played, for sure,” Gauff said. “Even though it wasn’t how I like to play, against her it’s so hard to be the aggressor sometimes. So the decisionmaking that I’m making is probably the best I’ve had, and I feel really confident in all my strokes.”

As well she should be.

It took just 68 minutes, the fastest women’s match of the tourney — and one of the most lopsided.

The win gave Gauff her first U.S. Open semifinal berth, and made her the first American teen to get this far in Flushing Meadows since 2001.

That star? Her athletic idol, Serena Williams.

“It means a lot to me,” Gauff said. “Being in any sentence with her is great. She’s the greatest player of all time; I’m nothing close to that yet. I’m just really honored to be in the same sentence as her.

“Never take it for granted. She’s my idol. If you told me when I was younger that I’d be in these same stat lines as her, I’d freak out. I’m trying not to think about it a lot, because I don’t want to get my head big or add pressure; but it is a cool moment to have that stat alongside her.”

No, Gauff isn’t the GOAT. But at just 19, she’s now two wins away from winning her first ever major, and is the betting favorite to do so.

She’s 16-1 since losing at Wimbledon and bringing on coach Brad Gilbert.

“Yeah, honestly, I wish I embraced the fun parts a little bit sooner,” said Gauff. “I thought to play and win you have to be ultra-serious and ultra-focused — which is true, but also you still have to enjoy it. That’s what’s been the change: I’m having more fun.

“The first meeting I had with Brad before he started coaching me, one of the first things he said is you need to smile more … When he said that I was a little surprised. I started to think and I was like, ‘Yeah, I do.’ That’s something I’m trying to work on and continuing to do, and it’s helping my results.”

Faced with a hard-hitting Ostapenko, she didn’t give the Latvian anything to hit. Gauff’s athletic defense — and well-placed returns — left Ostapenko flustered and frustrated.

After Ostapenko had made just 20 unforced errors in a three-set win over defending champ and world No. 1 Iga Swiatek on Sunday, the Latvian committed 21 in the second set alone on Tuesday.

“Honestly I was expecting a little bit more from her [Tuesday],” huffed Ostapenko, who chalked up her own scattershot play to a quick turnaround, getting in at 2 a.m. after her win over Swiatek and expecting to play at night on Tuesday.

“When I asked the day before, I was pretty sure I’m gonna play at night session, because that’s what they told me. When the schedule came out, I saw I’m playing first match and was, like, ‘Wow, that’s a little bit strange.’ ”

After losing to Ostapenko in Australia, Gauff was surprised at how easy Tuesday was, losing just seven points in a 20-minute first-set blitz.

The second set was only moderately tougher as she cruised into a date versus Karolina Muchova or Sorana Cirstea, who played late Tuesday.

“It’s just putting my life into perspective. I used to think negative things, like why is there so much pressure, why is this so hard, blah, blah, blah,” Gauff said. “There are people struggling to feed their families, who don’t know where their next meal is going to come from. … That’s real pressure, that’s real hardship, that’s real life. I’m in a very privileged position.

“Yeah, I just told myself, ‘Man, I should enjoy this.’ I’m having so much fun doing it. … I’m living a lucky life and I’m so blessed. I don’t want to take it for granted.”