Sinner shocked by Mensik as Alcaraz reaches Qatar Open semi-finals

World number two Jannik Sinner suffered a shock quarter-final exit at the Qatar Open against Jakub Mensik, while Carlos Alcaraz fought back to reach the last four.

The Italian fell to a 6-7 6-2 3-6 defeat against the 16th-ranked Czech in Doha.

After a tight opening set went the way of the underdog, Sinner appeared to regain composure by winning four straight games to dominate the second.

However, Mensik caught the major winner off guard in the decider, breaking serve in the opening game and again at 5-3 to seal a career-defining victory.

The Czech number one will now face Frenchman Arthur Fils as he continues his pursuit of a third singles title.

Alcaraz extends winning streak

In contrast to his rival, Carlos Alcaraz showed resilience to overcome Karen Khachanov 6-7 6-4 6-3 in a high-quality contest lasting nearly three hours.

Khachanov claimed the opening set via a tie-break, but the world number one roared back with superior shot-making to secure his semi-final berth.

The Spaniard performed in front of a crowd that included former Manchester United head coach Ruben Amorim.

This victory marks a 28th consecutive win on outdoor hard courts for the Australian Open champion.

Alcaraz now sets up a tantalising semi-final meeting with defending Qatar Open champion Andrey Rublev.

Gauff cruises through in Dubai

At the Dubai Tennis Championships, Coco Gauff produced a flawless performance to dismantle Alexandra Eala 6-0 6-2.

The third seed dominated the crowd favourite from the Philippines to reach the last four.

Gauff will next bid for revenge against Elina Svitolina, having lost heavily to the Ukrainian in the Australian Open quarter-finals earlier this year.

Svitolina advanced after ending the run of lucky loser Antonia Ruzic with a 3-6 6-2 6-3 victory.