It followed an injury suffered by Arnold shortly beforehand.

The withdrawal meant that English opponents Jenny Duncalf and Alison Waters secured a place in the last four.

Second seeds Dipika Pallikal and Joshna Chinappa will be their next opponents after surviving a close three-game battle with Canadians Samantha Cornett and Nikki Todd.

The Indians triumphed 10-11, 11-6, 11-8.

Rachael Grinham and Donna Urquhart of Australia were also made to dig deep before defeating Laura Massaro and Sara-Jane Perry of England, 10-11, 11-9, 11-8.

The top seven seeds all eased through to tomorrow's quarter-finals in the mixed doubles event.

Ninth-ranked Doug Kempsell and Lisa Aitken of Scotland completed the eight after topping Pool A following their shock win over top seeds and defending champions Paul Coll and Joelle King of New Zealand.

Coll and King won their final pool match against England's Adrian Waller and Victoria Lust 11-2, 11-8 today.

They will now face second seeded Indians Saurav Ghosal and Pallikal in an all-star quarter-final tie.

All finals will be played on Saturday (August 5).

The event will provide useful warm-up for doubles pairs competing at the 2018 Commonwealth Games in Gold Coast next year.

English city Manchester will also host this year's Professional Squash Association men's and women's World Championships, between December 9 and 17.