Rugby World Cup winning number 10 Dan Carter says it's the 'x-factor' that puts All Black Beauden Barrett ahead of rival first five-eighths at the Rugby World Cup.
Barrett, Ireland's Johnny Sexton and England's Owen Farrell have been the leading number 10s in the world since Carter retired from international rugby following the final at the 2015 tournament.
Barrett has won World Rugby player of the year twice (2016, 2017) while Sexton took out the award last year.
However, Barrett might not even be wearing the number 10 jersey at the World Cup, having been used at fullback this season with Richie Mo'unga starting at first-five.
In comparing Barrett, Sexton and Farrell, Carter told the Times what gives the All Blacks star the edge.