England's Nick Matthew celebrates his tenth month as world number one, according to the July Dunlop PSA Men's World Squash Rankings published today by the Professional Squash Association.

After becoming England's first world No1 for six years in June last year, the 30-year-old from Sheffield reclaimed the top spot in January, since when he has held the title unopposed.

In an unchanged top 20, Egypt's Ramy Ashour is at No2, while compatriot Karim Darwish is in third place and England's James Willstrop at No4.

Despite losing to rising Egyptian star Mohamed El Shorbagy in last month's final of the Squash Pro Internationaux de la Reunion on Reunion Island, Frenchman Thierry Lincou has held off the rankings challenge of the youngest player in the world top 20.

Lincou, who recently celebrated his 35th birthday, maintains his grip on eighth place, with El Shorbagy reducing the gap behind the former world champion at No9.

Two rising stars of European squash celebrate career-high rankings just outside the top 20. Nicolas Mueller consolidates his status as the top-ranked Swiss player of all-time by moving up two places to 33.

Since reaching his first PSA World Tour final in May 2007, the Zurich-based 21-year-old has been unbeaten in all finals thereafter and now boasts seven Tour title triumphs.

Simon Rosner becomes the third highest-ranked German of all-time after rising three places to No30. The 23-year-old five-time German National champion from Paderborn upset top-seeded Pakistani Aamir Atlas Khan in last month's Jena International Championship final in Kuwait to win the fifth and biggest PSA Tour title of his career.

July 2011 top 20 (inc. points average):
1     [1]     Nick Matthew     ENG     1,380
2     [2]     Ramy Ashour     EGY     1,331
3     [3]     Karim Darwish     EGY     959
4     [4]     James Willstrop     ENG     897
5     [5]     Amr Shabana     EGY     832
6     [6]     Gregory Gaultier     FRA     743
7     [7]     Peter Barker     ENG     596
8     [8]     Thierry Lincou     FRA     499
9     [9]     Mohamed El Shorbagy     EGY     483
10     [10]     Mohd Azlan Iskandar     MAS     432
11     [11]     David Palmer     AUS     418
12     [12]     Daryl Selby     ENG     407
13     [13]     Hisham Mohd Ashour     EGY     357
14     [14]     Omar Mosaad     EGY     356
15     [15]     Laurens Jan Anjema     NED     348
16     [16]     Wael El Hindi     EGY     339
17     [17]     Cameron Pilley     AUS     332
18     [18]     Adrian Grant     ENG     279
19     [19]     Alister Walker     BOT     263
20     [20]     Olli Tuominen     FIN     263

For full list - see www.psa-squash.com