Hallam is keen to make up for only winning silver

Hallam beat Wales' 1998 champion Kelly Morgan, who has returned after having a baby, to set up a last-eight match with New Zealand's Rachel Hindley.

She said: "Being top seed is new for me and brings added pressure. I'm trying to put it to the back of my mind."

Scotland's Susan Hughes had an easy win over India's Trupti Murgunde.

But England's Aamir Ghaffar is the only Briton in the last eight of the men's competition, after his 21-11 21-9 win over Wei Kiat Aaron Tan of Singapore.

In the women's doubles, English second seeds Gail Emms and Donna Kellogg beat Australians Kellie Lucas and Kate Wilson-Smith in straight sets.

Scotland's Michelle Douglas and Yuan Wemyss also reached the quarter-finals with victory over Jersey's Solenn Pasturel and Lucy Jane Burns, but will face a stiffer test in their next game against top seeds Malaysia.

But Tripp and Joanne Nicholas were knocked out by India's Trupti Murgunde and Saina Nehwal, despite winning the first set.

And Emms and Olympic silver medal partner Nathan Robertson cruised past New Zealand 21-17 21-7 to reach the mixed doubles quarter-finals.

Simon Archer and Ella Tripp are also through to the last eight after beating Canada's Robert Milroy and Tamara Sun 21-19 23-25 21-12.

Wales' Jonathan Morgan and James Phillips have reached the last eight of the men's doubles after a 21-7 21-9 win over Fiji's Ghee Ming Fong and Filivai Molia.