These four players have impressed in their debut season on the HSBC Sevens World Series - but who do you think deserves to be named the rookie of the year for sevens? br br Follow World Rugby on social media: br TWITTER.COMRUGBYWORLDCUP br FACEBOOK.COMRUGBYWORLDCUP br WWW.TWITTER.COMWORLDRUGBY br FACEBOOK.COMWORLDUGBY br INSTAGRAM.