Roland Garros got underway in the "ridiculous" chill and damp of Paris on Sunday with former world number one Victoria Azarenka walking off court, complaining that it was "too cold" to play.

The French Open, which was pushed back from its traditional May-June slot due to the coronavirus, began in steady drizzle and temperatures struggling to reach 10 degrees (50F).

It was all too much for Azarenka who left the almost deserted Court Suzanne Lenglen after just three games.

"I don't see the point of sitting on the court when it's eight degrees," fumed two-time major winner Azarenka.

On court she complained: "We are sitting like ducks. It's too cold, it's eight degrees, I live in Florida. This is getting a little ridiculous. I'm not waiting," she said before storming off to seek shelter.

She returned to complete a 6-1, 6-2 win, playing in black leggings and a tracksuit top.

"Does it increase the risk of players getting injured? Absolutely, I think that it does," she added ahead of a week in which the cold, wet conditions are forecast to continue.

That echoed fears expressed by 12-time champion Rafael Nadal who said the conditions combined with a new heavier ball could cause elbow and shoulder problems for players.

On Court Simonne Mathieu, Belgian 16th seed Elise Mertens and Russia's Margarita Gasparyan twice left the arena after also halting play due to the slippery conditions.

There were no such problems, however, for top seed and former champion Simona Halep who swept into the second round with a 6-4, 6-0 victory over Spanish world number 70 Sara Sorribes Tormo.

Playing under the new roof of Court Philippe Chatrier, second-ranked Halep, who won the 2018 title, trailed 4-2 but claimed the final 10 games to progress in 82 minutes.

Italian teenager Jannik Sinner had the honour of claiming the first ever win under the roof, demolishing Belgian 11th seed David Goffin 7-5, 6-0, 6-3.

The 19-year-old Sinner reeled off 11 games in succession as he defeated Goffin for the second time in as many meetings.

Another early winner was Sebastian Korda, the son of 1992 Roland Garros runner-up and 1998 Australian Open champion Petr Korda, who saw off Andreas Seppi of Italy 6-2, 4-6, 6-3, 6-3.

Wintry weather was the last thing organisers needed after playing cat and mouse with the impact of Covid-19 in recent weeks.

A resurgence of cases has cut attendance to just 1,000 spectators a day. In 2019, more than 500,000 people watched the two-week tournament on site.

Organisers had hoped to welcome 20,000 fans a day but in the space of just a few weeks, that figure was quickly downsized to 11,500, then 5,000 before the French government slashed it to a 1,000 maximum.

'Millions up in smoke'

"Tens of millions of euros have gone up in smoke," said French Tennis Federation (FFT) marketing chief Stephane Morel as he mourned the loss of ticket income.

Players, meanwhile, have been confined to two tournament hotels with tight restrictions on their movements.

On site, normally bustling shops, food outlets and other commercial stalls have been shuttered.

Everyone at the tournament, including players if they are not in action or in practice, is masked. Hand sanitisers dot the site.

Later Sunday, Andy Murray and fellow former three-time major winner Stan Wawrinka meet in the day's marquee clash in a rematch of their 2017 semi-final blockbuster.

The Swiss prevailed in that five-setter, a match so gruelling that it contributed to Murray's lengthy battle with a hip injury which pushed him to the brink of retirement.

The day after sister Serena celebrated her 39th birthday, 40-year-old Venus Williams, who made her debut in Paris in 1997, was taking on Anna Karolina Schmiedlova of Slovakia.

Schmiedlova hasn't won a match at a Slam in five years.

Nadal, bidding to win a 13th Roland Garros and move level with the absent Roger Federer on a record 20 majors, plays Monday against Egor Gerasimov, the 83rd-ranked Belarusian.

World number one Novak Djokovic, chasing an 18th major, will get underway on Tuesday boasting a record in 2020 of 31 wins and just one loss due to his US Open default when he swiped a ball away in frustration and struck a line judge.

The 33-year-old Serb faces Sweden's Mikael Ymer in the first round.

Serena Williams, pursuing an elusive 24th major, gets her campaign underway on Monday against fellow American Kristie Ahn.