- Wales earn a national record 81-7 win over Namibia at Rugby World Cup
- The 12 tries give Wales their biggest-ever winning margin in tournament
- George North, 19, crosses twice to become World Cup's youngest try scorer
- Wales battling with Samoa for Group D's second quarterfinal place
Wales scored 59 second-half points against Namibia on Monday to seal a record 81-7 victory at the Rugby World Cup in New Zealand.
The emphatic win featured 12 tries for Warren Gatland's side, their best total in a World Cup match, and also saw 19-year-old George North become the youngest try scorer in the tournament's 24-year history.
Namibia, now eliminated from Pool D after four defeats, fought bravely in the opening period as the Africans held Wales to 22-0 at halftime.
But the floodgates opened in the second period as Wales comfortably secured their biggest winning margin in a World Cup match, bettering a 72-18 success against Japan in 2007.
The Welsh are now on the brink of reaching the quarterfinals for the fourth time, moving second above Samoa ahead of their closing clash with Fiji on Sunday.
The Samoans also have 10 points, but earlier lost to Wales and face the tougher task of a final match against unbeaten world champions South Africa in Auckland on Friday.
If the Springboks win by more than seven points and Samoa do not earn a bonus for scoring four tries, then Wales will go through ahead of the match in Hamilton.
"We started off with 22 points in 15 minutes, but then the players thought the job was done and went to sleep," New Zealander Gatland, who coached Ireland between 1998 and 2001, told the tournament's official website.
"They got a bollocking at halftime, and in the second half I thought our impact off the bench was good and I was happy with the end result."
Scott Williams had a World Cup debut to remember, as the center notched a hat-trick and opened the scoring with his first try after seven minutes.
Wing Aled Brew and Tonga-born back-row forward Toby Faletau added two further tries to put Wales firmly in control inside the first 20 minutes, but Namibia rallied and kept their opponents at bay until the second period.
Williams broke Namibia's resilience six minutes after the restart with his second score, before prop Gethin Jenkins added a fifth try for Wales with 49 minutes on the clock.
With the score at 36-0, Namibia had a moment to savor as lock Heinz Koll touched down over the Welsh line for his country's fifth try of the tournament.
But it was only a brief respite, as North crashed over for his landmark try to eclipse the record previously held by Australia's Joe Roff.
Kicker Stephen Jones, who earned a record 101st cap for Wales, scored 15 points to move beyond the 900-mark in international rugby.
Center Jonathan Davies grabbed a try two minutes later, before North scored his second and Williams completed his treble.
Wales added three more tries in the final 10 minutes through scrumhalf Lloyd Williams, fullback Lee Byrne and lock Alun-Wyn Jones.