Prime Minister Datuk Seri Najib Tun Razak today congratulated Malaysia's seven-time world squash champion Datuk Nicol Ann David when she retained her US Open title for the second successive year after defeating world number two Laura Massaro, of England.

The congratulatory message was picked up from Najib's Tweeter account at 12.16pm today, after Nicol beat Laura in a gruelling five-set thriller in the final yesterday.

"Congratulations Nicol David for winning the US Championship title. Well done!" he said in his Tweeter account.

The current world number one won her maiden US Open title last year when she defeated Egypt's Raneem El Weleily in the final.

In this year's final lasting one hour and 24 minutes, Nicol beat Laura 13-11, 11-13, 7-11, 11-8, 11-5 at Drexel University, Philadelphia at 7pm Friday (7am Malaysian time, Saturday).