Details of all of today's action below;
11.30am - Pool B: Samoa v USA
Kick off: 12pm
Coverage of the first of the day's three matches comes from the Brighton Community Stadium, as the Pool B sides get their campaigns under way. With South Africa and Scotland among the other nations in this pool, both teams will be well aware of the importance of winning this fixture if they are challenge the top two's expected supremacy.
2pm - Pool A: Wales v Uruguay
Kick off - 2.30pm
Pool A continues with this fixture at the Millennium Stadium in Cardiff, where Wales will expect to record a comfortable victory against the South Americans. Uruguay are playing in only their third World Cup and their first since 2003, having edged past Russia in a two-legged play-off to qualify, but could not have been given any tougher task than that which awaits them in the so-called Pool of Death.
4.30pm - Pool C: New Zealand v Argentina
Kick off: 4.45pm
The opening round of fixtures reaches a conclusion with this Pool C match at Wembley Stadium, as the reigning champions begin the defence of their title against the Pumas. Regardless of the result of this match, both nations are heavily fancied to reach the quarter-finals, with the All Blacks starting as tournament favourites, as they aim to become the first side to successfully defend their crown.