The 42-year-old Australian windsurfer will be going for his fourth-straight title in the marquee marathon on Saturday.
Allen, a nine-time world champion, has been a regular at the event over the competition’s 32 years.
“I’m looking forward to returning to the WA coast and competing against some of Australia’s strongest windsurfers,” he said.
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“Last year was such a good race against Cyril (Moussilmani),” Allen said.
“It was so great having some of the best international riders to race against in The Classic.
“The competition has really grown since the first time I competed in the early ’90s.”
The meet runs from Friday to Sunday, with kitesurfing, jet ski, paddle and windsurfing wave riding also a part of it.
Organisers are expecting thousands to attend over the three days.