Top-seeded Carlos Alcaraz lost for just the second time this year on Thursday when 25th-ranked Jiri Lehecka beat him 6-3, 3-6, 6-4 in the quarterfinals of the Qatar Open.

Jannik Sinner has been dropped from an exhibition event in Las Vegas next month while the No. 1-ranked men's tennis player is serving a three-month ban connected to a pair of failed doping tests.