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ONE Championship: Dynasty of Heroes (also known as ONE Championship 55) was a mixed martial arts event held by ONE Championship on May 26, 2017 at the Singapore Indoor Stadium in Kallang, Singapore. Background This event featured two world title fight for the ONE Women's Atomweight Championship Angela Lee of Singapore makes the second defense of her title against top contender Istela Nunes of Brazil as ONE Championship: Dynasty of Heroes headliner, for the ONE Welterweight Championship ONE Welterweight World Champion Ben Askren defends his title against rising young Malaysian star Agilan Thani as co-main event.

ONE Fighting Championship brings its trademark brand of exhilarating non-stop MMA action to the Middle East for the first time with a blockbuster show scheduled in Dubai, UAE, on 29 August. Get ready for the BIGGEST Fight Card in the history of ONE Fighting Championship with 4 world championship title fights scheduled. Witness world-class MMA action at its best as some of the biggest stars in MMA today enter the ONE FC cage to do battle, including Japanese MMA superstar Shinya "Tobikan Judan" Aoki, welterweight kingpin Ben "Funky" Askren, ONE FC Welterweight World Champion Nobutatsu Suzuki, MMA veteran Kamal Shalorus and many more.