When Michael Phelps lost his first major individual competition in four years at the World Championships in Rome it was a defeat which could help define the sport for decades to come.
Paul Biedermann finished ahead of Phelps, who won eight gold medals at the Beijing Olympic Games, with a new world record in the 200-meter freestyle - but the win was marred with controversy.
Biedermann was wearing the Arena X-Glide polyurethane suit, considered faster than Phelps' Speedo LZR Racer, which gave him an extra advantage in the race. 
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