Mazda Motor Corp's new open-top sports car "Roadster", also known as "MX-5" in overseas markets, is displayed at an unveiling in Tokyo May 20, 2015. The lightweight two-seater, equipped with Mazda's newly-developed direct injection SKYACTIV-G 1.5-liter engine, will go on sale on public throughout Japan from May 21, 2015. REUTERS/Issei Kato