Serena Williams and Naomi Osaka made lightning starts before rain halted day one of the Australian Open on Monday, causing further chaos after a build-up hit by haze from raging bushfires.
Hazardous smog left several players with coughs and breathing difficulties during qualifying last week, prompting speculation about whether the year's first tennis Grand Slam would be delayed.
Air quality was rated as 'good' as the tournament started but four hours later at about 3:00 pm (0400 GMT), play was suspended on most courts as a downpour hit Melbourne Park.
World number three Roger Federer was briefly hauled off court while the roof was closed on Rod Laver Arena, before returning to complete a routine 6-3, 6-2, 6-2 victory over Steve Johnson.
Play also continued under the retractable roofs of Margaret Court Arena and Melbourne Arena, but was impossible elsewhere as rain persisted.
More rain is forecast for Tuesday, threatening further disruption at a tournament more often associated with extreme heat at the height of the Australian summer.
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Officials said play would resume on the outside courts once the rain stops, and would continue into the evening under floodlights to complete Monday's schedule of 64 matches.
Defending champion Osaka avoided the downpour as she dismissed Marie Bouzkova of the Czech Republic 6-2, 6-4 in 80 minutes, breaking a net fitting with one powerful serve in the process.
"It was really tough for me trying to control my nerves," said Osaka. "It's tough to play someone you've never played before in the first round of a Grand Slam."
"I feel like I can still improve and get better throughout this tournament, for sure. This is a good stepping stone for right now."
- Shapovalov row -
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