Jannik Sinner's emerging domination of men's tennis will face its next challenge when he takes on world No.12 Grigor Dimitrov in the final of the Miami Open.

Sinner overwhelmed third-seed Daniil Medvedev 6-1 6-2 on Friday in the last four to set up Sunday's title clash (Monday AEDT).

The No.2 seed, rock-solid with his firecracker forehand, became the first man to reach back-to-back Miami Open finals since John Isner (2018-2019).

In last year's final, Medvedev prevailed over Sinner at Hard Rock Stadium, but this time, the Russian's three games tied his career low for wins in a match. He committed 22 unforced errors.

"I'm happy about this season - who wouldn't be happy?" Sinner said.

"I know the players will get to know me more and study me, so I have to be ready."

Sinner, 22, will play in the final against 11th-seeded Dimitrov, who beat Alexander Zverev in the other semi-final having knocked out top seed Carlos Alcaraz in the previous round.

Sinner began his revenge against Medvedev for last year's Miami defeat by beating him in the Australian Open final in January - rallying from two sets down.

On Friday, the Italian posted his fifth straight win over Medvedev - all in the past 12 months.

"He's serving 10 times better," Medvedev said.

"He always served well, but now he serves big, big."

This match proved a lot easier than Melbourne Park as Sinner jumped to a 5-0 lead with two straight breaks of the Russian's serve. It was over in 69 minutes.

Sinner's opponent in the final, the surging Bulgarian Dimitrov, backed up his upset of Alcaraz by beating Zverev 6-4 6-7 (4-7) 6-4.

The victory gave Dimitrov, 32, back-to-back wins over top-five opponents for only the second time in his career.

"Whatever I say doesn't do it justice," Dimitrov, who should next week return to the world's top 10 for the first time since 2018, said.

"I fight my own battles. I run my own race. All that comes with the work we all put in as a team.

"I kept on believing. This is just a cherry on the cake."

Sinner broke Medvedev four times, was unbroken himself, had seven aces and won 80 per cent of his first serves.

"This year, I have another chance," Sinner said in his on-court interview.

"I don't think he played his best tennis and I tried to stay focused and in my rhythm."

Sinner, whose only loss this year was to Alcaraz in the Indian Wells final earlier this month, said Friday was "one of the best matches in how I handled everything".

"It's a great feeling," he said.

Long ago touted as the next major champion, Dimitrov has yet to reach a final at any of the four majors.

But Alcaraz can attest to the mercurial Bulgarian's current play, saying after his quarter-final loss, "He played amazing tennis, almost perfect. He made me feel like I'm 13 years old.''