Athletes have been ranked in order of how likely they are to get sunburn at the 2020 Tokyo Olympics.
The ladies single tennis champion will catch the most UV rays due to their clothing and playing during peak sunshine hours, scientists say.
Also at a higher risk of burning is whoever will win the men's golf and men's road race cycling.
Researchers calculated the average sun exposure for 144 outdoor competitions set to take place at the world-renowned games next year.
Being extremely exposed to the sun can raise the risk of skin cancer. Nine in 10 cases of melanoma can be prevented with proper sun care.
The women's single tennis champion will catch the most UV rays due to their clothing and playing during peak sunshine hours. Pictured, leading tennis star Serena Williams
The study, led by Dr Nathan Downs at the University of Southern Queensland, used a range of measurements to predict the at-risk professionals.
Dr Downs used satellite data on cloud cover, ozone and aerosol concentrations to create a model of the UV rays athletes will be exposed to in Tokyo.
He then looked at what time of day the events are usually held at, how long they tend to last and whether they take place on grass, concrete, water or sand, as each of the surfaces reflect the sun's rays to a different extent.
He used footage of Rio Olympics 2016 to look at what type of clothing is usually worn by competitors, and what body parts would be most exposed to sun based on posture.
The results, published in the journal Temperature, showed the duration of events and the time of day that they take place in are the most important factors influencing UV exposure.
Athletes who should be most careful were found to compete in singles tennis, golf, the cycling road race, beach volleyball, hockey, rugby, the decathlon, the triathlon, football, softball and the 10km marathon swim.
Beach volleyball players' lack of clothing, coupled with the fact their matches take place on highly reflective sand also put them at considerable risk.
But tennis, golf and cycling stars should be the most concerned with using suncream, according to the findings.
Men's golf players were among the top at-risk, the study found, but are protected to an extent by the trousers and cap they wear. Pictured, Justin Rose, champion at Rio 2016
The study looked at the surfaces games are held on, as well as the time of day and length. Pictured, Greg van Avermaet, winner of the Rio 2016 men's cycling road race
Female tennis players are only more at risk because male tennis stars tend to wear protective caps.
Dr Downs explained: 'The winner of the women's singles tennis will have to compete in six rounds, many of which will be at peak midday.
'Golfers must also compete in four daytime rounds, and the winner of the