TOKYO - Wind and rain buffeted the Tokyo region on Tuesday causing delays to Olympic competition and event rescheduling, while tennis superstar Naomi Osaka dropped out of the Games after she was beaten in the third round of her singles tournament.

Osaka, who lit the Olympic cauldron on Friday to open the Tokyo Games, was swiped aside by Czech Marketa Vondrousova in a match where the Japanese player seemed out of sorts and never settled into a rhythm. 

While Olympic organisers remained on alert to monitor the impact from a tropical storm off Japan's east coast, those competitors unaffected by the weather got Day Four of competition off to a flying start.

Flora Duffy achieved instant national hero status when she won Bermuda’s first Olympic gold medal with victory in the women's triathlon.

The 33-year-old hailed it "an incredible moment" and as Bermuda became the least populous nation to win a Summer Olympics gold its Premier David Burt sent his congratulations over Twitter, saying: "You've worked so hard and you've made an entire island proud!"

In the pool, Russian Evgeny Rylov broke a U.S. stranglehold on the men's 100m backstroke, becoming the first non-American to win the event at an Olympics since 1992.

Tom Dean powered to gold in the men's 200m freestyle, heading a British one-two with Duncan Scott taking silver.

MAN AGAINST OCEAN

Australian Kaylee McKeown took the women's 100 metres backstroke gold, and Lydia Jacoby won the women's 100m breaststroke for the United States.

At the archery venue, early rounds of the individual events were delayed by some two and a half hours, and were now due to start at noon local time.

The conditions meant there was no training on the practice field at Tokyo's Yumenoshima Park Archery Field, with staff in rain coats placing non-slip mats around the facility.

If the archers were left frustrated, though, the surfers were embracing the wet and windy conditions.

"Today is one of those days when it's man against ocean, more so than competing against your competitor, but that's what makes it fun," Japanese surfer Kanoa Igarashi told reporters after scoring a spectacular early barrel wave en route to a quarter-final victory over American Kolohe Andino.

"It's great that we have waves. It's about who wants it more."

Japan's hot, wet and unstable summer weather patterns have been a persistent concern for the Games, which opened on Friday, compounding difficulties for an Olympics being held under a COVID-19 state of emergency.

Tokyo was forecast to receive up 31.5 mm (1.2 inches) of rain over 24 hours from tropical storm Nepartak, now forecast to make landfall in the north early Wednesday, the Japan Meteorological Agency said. It was headed toward Sendai, 370 km (230 miles) up the coast from Tokyo, according to the Tropical Storm Risk monitoring site.

Athletes could, however, welcome a slight respite from the extreme heat that had earlier caused an Olympic archer to collapse. Tuesday's forecast high temperature was 31 degrees Celsius (88 degrees Fahrenheit), below recent highs of 35 degrees Celsius (95 degrees Fahrenheit).

(Reporting by William Mallard; Editing by Stephen Coates and Michael Perry) ((william.mallard@thomsonreuters.com; +81 3 4563 2749;))