What happened on the opening day?published at 04:51 Greenwich Mean Time
German second seed Alexander Zverev began his latest bid for a first Grand Slam title with a comfortable straight-set victory over French wildcard Lucas Pouille at the Australian Open.
The 27-year-old, who reached the semi-finals in Melbourne last year, cruised into the second round with a 6-4 6-4 6-4 win.
Norwegian sixth seed Casper Ruud narrowly avoided becoming the first top-10 casualty in Melbourne as he came through in five sets against Spain's Jaume Munar.
The 26-year-old, who is a three-time Slam runner-up but has never gone beyond round four at the Australian Open, won 6-3 1-6 7-5 2-6 6-1.
Meanwhile, Kei Nishikori revealed he "almost" quit tennis last year after he saved two match points to beat Brazil's Thiago Monteiro 4-6 6-7 (4-7) 7-5 6-2 6-3 and clinch his first win at the Australian Open since 2019.