Scott Williams scored a hat trick of tries in an 81-7 win for Wales on Monday which ensured Namibia was the first team eliminated from the Rugby World Cup.

Playing his national record 101st test, flyhalf Stephen Jones opened the scoring with a penalty goal and centre Williams crossed in the eighth minute — the first of 12 Welsh tries.

"We got the bonus point which is what we wanted. Namibia made it very tough for us, especially at the contact area," Wales captain Sam Warburton said. But "The game broke up in the second half. The boys showed their skills and we got 12 tries, which will be important for points difference at the end of the group."

Wales took a 36-0 lead when big prop Gethin Jenkins threw a dummy to slice through the defensive line and then sprinted up field before barging his way over the tryline. Namibian locks Nico Esterhuyse and Heinz Koll combined almost immediately for a long-range try sparked from an intercept in the 53rd which delighted the Stadium Taranaki crowd.

The predominantly amateur Namibia team finished with four heavy defeats in 14 days, including an 87-0 loss to defending champion South Africa last week.

Wales, which opened with a one-point loss to South Africa, edges into second spot in Pool D with wins over Samoa and Namibia and a match remaining against Fiji.

Jones finished with six conversions and a penalty goal, surpassing 900 career test points, before he was replaced by Rhys Priestland.

The Welsh led 22-0 at half time but had difficulty at times against the combative Namibians, who didn't concede a point during a 30-minute period until fatigue set in. The 42 missed tackles cost Namibia dearly, with Wales running in tries almost at will in the last quarter.

"That's why they're a top-class team. They just blew us away and we couldn't stop them," said Namibia captain Jacques Burger, one of the few professional players in the squad. "We played against a really good side and played a game four days ago against the Springboks, so it was tough.

"But we're not making excuses. We weren't good enough today. it's the end of the World Cup for us."

Rugby World Cup 2011