Rising star Tankiewicz knows he must work hard - Barry-Murphy

[Huw Evans Picture Agency]Brian Barry-Murphy has reiterated that Cardiff City rising star Rob Tankiewicz must continue to improve following his starring role in Tuesday's pre-season win over Cork City.Tankiewicz, 17, scored a second half brace as the Bluebirds battered the League of Ireland First Division side 6-1 in their second summer friendly.The Wales youth international temporarily became Cardiff's youngest player last season after debuting aged 16 years and 117 days before team-mate Axel D