Australian world No 4 David Palmer has advanced to the US Open Squash Championship quarter-finals with a 11-6 11-9 11-5 win over England's James Willstrop in Boston.

Palmer, who won the 2002 US Open and was runner up last year, faces a huge Aussie battle for a place in the semi-finals against South Australian qualifier Dan Jenson.

Fellow Australian Anthony Ricketts took world No 1 Peter Nicol to the limit in a classic contest.

Rickets, who is seeded 13th, eventually went down 8-11 11-7 11-5 9-11 11-9 in a five-game marathon.

Quarter-final line-up: (1] Peter Nicol (Eng) v [7] Nick Matthew (Eng); (8] Joseph Kneipp (Aus) v [Q] Simon Parke (Eng); [4] David Palmer (Aus) v [Q] Dan Jenson (Aus); [2] Lee Beachill (Eng) v Graham Ryding.

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