Reflecting the depth of the Japanese team, all four qualified through competition rather than depending on host allocations. Only the US and France also boast a full contingent of athletes among the 40 climbers.

The 20 men and 20 women will be seeking the top combined score from three events - speed, a vertical sprint up a fixed route; bouldering, which tests problem solving skills on low walls; and lead, a technical climb on the clock.

In the men's competition, Tomoa Narasaki is seen as the main rival to Czech Adam Ondra, who excels in the lead and bouldering events but has had to focus on speed as well due to the unusual combined format.

Narasaki, a bouldering specialist with gymnastics experience, brings his dynamic climbing style to the speed event and is famed for the "Tomoa skip", which bypasses a lower handhold to take a straighter line up the 15 metre wall.

"Second in speed, first in bouldering and third in lead - that would give me six points," was the 25-year-old's assessment of how he would like his competition to go.

While Slovenia's Janja Garnbret is favourite to land the women's gold, Japanese duo Akiyo Noguchi and Miho Nonaka are also seen as strong contenders.

Noguchi, 32, is a close friend of Narasaki and a senior stateswoman of the sport who continues to rank highly in bouldering after competing in climbing for more than 15 years.

"Bouldering is my best event so that's been the main focus but I've been practising a lot in speed, which I'm weak in, and I hope to demonstrate that," said Noguchi.

Like Britain's Shuana Coxsey, Noguchi will retire from professional climbing after the Games having extended her career to appear on home turf in Tokyo.

Australian Associated Press