Indian runner O P Jaisha, an Asian Games medallist in 1,500m and 5,000m events, made a memorable marathon debut here today by breaking the 19-year-old national mark of Vally Satyabhama to qualify for the World Championships in Beijing later this year.

Jaisha clocked 2 hours, 37 minutes and 29 seconds in the 12th Standard Chartered Mumbai Marathon to better the nearly two-decade-old national mark of 2:39:10 set by Satyabhama from December 21, 1995, in Chennai.