Twin Tour title triumphs last month by Nicol David have extended the Malaysian's lead at the top of the Women's World Squash Rankings, according to the new June list published today by the Women's International Squash Players' Association (WISPA).

The 25-year-old from Penang avenged her shock defeat by Natalie Grainger in the final of the KL Open in March by beating the world number two from the USA in the finals of both the Cayman Islands Open and Texas Open - and now boasts more then twice the number of ranking points (3,340) of her nearest rival.

Sisters Rachael Grinham, representing Australia, and Natalie Grinham, now a Dutch national, are at three and four, respectively.

But a change in the English hierarchy sees Londoner Alison Waters jump one place to No5 to become the highest-ranked player from England - ahead of sixth-placed Jenny Duncalf, and Laura Lengthorn-Massaro, who slips to eight.

Waters, 25, celebrated her second WISPA title success at the Cannon Kirk Homes Irish Open in Dublin in April.

Victory in the Hurghada International on home soil in April helped lift Egypt's Omneya Abdel Kawy to seventh place in the new list.

1 [1] Nicol David MAS 3340
2 [2] Natalie Grainger USA 1650
3 [3] Rachael Grinham AUS 1360
4 [4] Natalie Grinham NED 1317
6 [6] Alison Waters ENG 984
5 [5] Jenny Duncalf ENG 968
8 [8] Omneya Abdel Kawy EGY 841
7 [7] Laura Lengthorn-Massaro ENG 801
9 [9] Madeline Perry IRL 798
10 [11] Shelley Kitchen NZL 591
11 [10] Isabelle Stoehr FRA 559
12 [12] Vanessa Atkinson NED 541
13 [13] Kasey Brown AUS 525
14 [15] Tania Bailey ENG 500
15 [14] Rebecca Chiu HKG 494
16 [16] Samantha Teran MEX 462
17 [18] Jaclyn Hawkes NZL 458
18 [17] Annie Au HKG 429
19 [20] Raneem El Weleily EGY 413
20 [19] Lauren Briggs ENG 377