Japan's victory over Ireland at the Rugby World Cup should not be considered a huge upset, according to Rory Best.
Ireland were sensationally upset by hosts Japan at the Rugby World Cup on Saturday, leaving Brian O'Driscoll stunned by their performance.
Ireland's Rugby World Cup hopes took a huge hit as hosts Japan produced another finals shock in Shizuoka.
Japan eased past Russia in their Rugby World Cup opener but will face a far sterner test against Ireland, who will be without Johnny Sexton.
Ireland coach Joe Schmidt has made four changes for the Pool A clash against hosts Japan, with Jack Carty starting at fly-half.
Rugby World Cup hosts Japan will become the latest outfit to attempt to unsettle Ireland superstar Johnny Sexton this weekend.
Gregor Townsend bemoaned Scotland's sluggish start in their loss to Ireland as he admitted to concern over the injured Hamish Watson.
Ireland downed Scotland in their Rugby World Cup opener and should have Johnny Sexton available for next weekend's second Pool A game.
Rory Best began his final Rugby World Cup campaign with a try as Ireland accelerated away from Scotland en route to an opening win.
Johnny Sexton and Rory Best led the way as Ireland's thumping win over Scotland affirmed their credentials as Rugby World Cup challengers.
Johnny Sexton was taken off with injury against Scotland earlier this year and Gregor Townsend's men intend to get physical again.
The enthusiasm of Jordan Larmour, Andrew Conway and Jacob Stockdale can spur Ireland on against Scotland, according to Joe Schmidt.
Scotland's side to face Ireland in their Rugby World Cup opener features 10 changes from the win over Georgia.
Keith Earls and Rob Kearney have been left out of Ireland's Rugby World Cup Pool A clash with Scotland amid fitness concerns.
Ahead of the Rugby World Cup, three Omnisport writers take a look at the main talking points for the tournament in Japan.
Japan defeated South Africa four years ago and Ireland great Brian O'Driscoll believes they could provide another Rugby World Cup upset.