Qatar Open: Karatsev retires, Kubler through to second round

Australian Jason Kubler moved into the second round of the Qatar Open when Russian Aslan Karatsev retired on Monday at the Khalifa International Tennis and Squash Complex in Doha.

Kubler, ranked No 74, led 7-6 (4), 1-0 when Karatsev, ranked No 101, pulled out at the Khalifa International Tennis and Squash Complex in Doha on Monday afternoon.

The Australian will face second seed Felix Auger-Aliassime next.

Doha ATP250, other first-round results (Khalifa International Tennis and Squash Complex, hard, USD 1.377.025, most recent results first):

• Abedallah Shelbayh vs. SoonWoo Kwon
• Roberto Bautista Agut vs. Marton Fucsovics
• Ilya Ivashka vs. Botic van de Zandschulp
• Nikoloz Basilashvili vs. Alexandre Muller
• Emil Ruusuvuori vs. Daniel Evans
• Damir Dzumhur vs. Jiri Lehecka
• Tallon Griekspoor vs. Quentin Halys
• Alejandro Davidovich Fokina vs. Constant Lestienne
• Lorenzo Sonego vs. Andy Murray
• Oleksii Krutykh vs. Liam Broady
• Fernando Verdasco vs. Christopher O’Connell