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Serbia Novak Djokovic advances to Australian Open semi-finals after Czech Jakub Mensik withdraws injured, tournament organisers say, a month after event began.
Mensik says decision unfortunate, citing increasing pain in left side of abdominal muscles following last two matches.
Djokovic gains extra rest day ahead of next round.
Spain Carlos Alcaraz, world No 1, reaches quarter-finals after beating American Tommy Paul 7-6 (8-6) 6-4 7-5 on Rod Laver Arena. Alcaraz faces Australia Alex de Minaur, sixth seed, who defeats Kazakhstan Alexander Bublik 6-4 6-1 6-1. Alcaraz yet to go beyond quarter-finals in Melbourne and has not dropped a set this year. Title win would make him youngest man to complete career Grand Slam.
Germany Alexander Zverev, third seed, also reaches quarter-finals with 6-2 6-4 6-4 win over Argentina Francisco Cerundolo, to face American Learner Tien, who eliminates Russia Daniil Medvedev 6-4 6-0 6-3.
In women draw, Belarus Aryna Sabalenka reaches quarter-finals, beating Canada Victoria Mboko 6-1 7-6 (7-1). Defending champion meets 18-year-old American Eva Jovic, who thrashes Kazakhstan Yulia Putintseva 6-0 6-1. Sabalenka yet to a set and aims for third Australian Open title.
American Coco Gauff advances to quarter-finals after defeating Czech Karolina Muchova 6-1 3-6 6-3, to face winner of Elina Svitolina and Mirra Andreeva.
Djokovic says after withdrawal: ‘I feel sorry for him. These things happen in sport. I wish him a speedy recovery.’