Kevin Mayer of France is the decathlon World record holder, Germany's Niklas Kaul is the reigning World champion, while Maicel Uibo of Estonia is the World Championships silver medalist.
Mayer will compete from his training base in Montpellier, France, Kaul will contest in Mainz, Germany, while Uibo will do the triathlon from his training base in Clermont, Florida.
What events will the athletes do at the Ultimate Garden Clash - Combined Events?
The event will kick off with the pole vault where the athletes will try to clear 4.00m hight as many times as possible during a 10-minute period. The next event is shot put where the challenge is to throw the 7.26kg sphere over a 12-meter mark as many times as possible, during a 10-minute period. The challenge will wind up with a back and forth run between two cones that are set 20 meters apart. The athletes will get points for every completed back-and-forth run between the cones during a 5-minute period.
Where and how to watch the challenge?
The event will be streamed live on the World Athletics YouTube channel, Twitter feed, and Facebook page starting at 17:00 Central European Time / 3:00 pm GMT.