Olympic champions Usain Bolt and Mo Farah lead a cast of the world's leading athletes descending on Glasgow to compete in the Commonwealth Games starting in Scotland's biggest city on Wednesday. World-record holders, decorated Olympians and novice participants make up the 6,500 athletes representing 70 Commonwealth nations who share the aim of claiming prizes in 261 medal events in 17 sports. Scotland hosts the 20th edition of the multi-sport event for the third time and instead of trying to emulate the success of the London 2012 Olympic Games, it will offer something quite different over 11 days of competition. Although the Games may not be held in the same regard as the Olympics or a world championship without superpowers such as the United States, China and Russia, there will be plenty of household names and fairytale stories. Six-times Olympic gold medallist Bolt will bring a dose of showmanship to the Hampden Park running track when the towering Jamaican attempts to win his first Commonwealth medal in the 4x100 metres relay.