Emerging Spanish star Carlos Alcaraz continued his rise with a 7-5 6-3 loss to third seed Stefanos Tsitsipas to reach the Miami Masters quarter-finals on Tuesday.

The 18-year-old, who reached the last eight of the US Open last year after beating Tsitsipas in the third round, proved too good for the Greek again in an hour and 50 minutes.

Alcaraz reached the Indian Wells semi-finals last week and are now 15-2 this season, with the victory prompting a clash with Serbian Miomir Kecmanovic which upset last week’s Indian Wells champion Taylor Fritz 3-6 6-1 6-4.

Tsitsipas beat the Spaniard in the sixth game and led 5-2 before Alcaraz clinched seven consecutive games to sensationally win the first set.

Alcaraz took the lead in the second set, their defense and speed leaving Tsitsipas short of answers.

The Spaniard, who saved seven of eight break points throughout the match, converted his fourth match point into victory.

“It was really, really tough. He was playing amazing,” Alcaraz said after the game. “All I can say is that I fought until the last ball in the first set [to] return.”

Ninth seed Jannik Sinner won 7-6 (7-3) 6-3 against enigmatic Australian Nick Kyrgios, who had a furious outburst aimed at referee Carlos Bernardes.

The Aussie was heard calling Bernardes “an absolute clown” and continued to berate the referee late in the first set, resulting in a code violation and two penalties.

Kyrgios completely lost his temper, demanding to speak to a tournament official before breaking his racquet early in the second set, also resulting in a game penalty.

Sinner will next face Argentinian Francisco Cerundolo after beating 28th seed Francis Tiafoe 6-7 (2-7) 7-6 (7-3) 6-2.

Top seed Daniil Medvedev made light work of Jenson Brooksby 7-5 6-1 to set up a quarter-final showdown with defending champion Hubert Hurkacz who won 7-6 (7-3) 6-2 over Lloyd Harris. Medvedev will return to the top of the ATP rankings if he wins their quarter-final.

Second seed Alexander Zverev beat Thanasi Kokkinakis 6-4 6-4 and will meet sixth seed Casper Ruud in the last eight, after the Norwegian won 6-3 6-4 over Britain’s Cameron Norrie.