NAIROBI, Sept. 13 -- Teamwork will be critical for Kenyan runners Gladys Cherono and Edna Kiplagat when they line up for the Berlin marathon on Sunday.

The two have expressed their doubts in tackling the world record of 2:15:25, set by Britain's Paula Radcliffe 15 years ago.

Instead, they are focused on setting a new course record in Berlin. Cherono is the race defending champion and is eyeing the third crown in the German capital.

The current course record was set in 2005 by Japan's Olympic champion Mizuki Noguchi, who ran 2:19:12, which also stands as the Asian record to this day.

Cherono, who won the title last year, running 2:20:23 holds her best time at 2:19:25 set in winning the first of her two Berlin titles in 2017.

"I want to break my personal best on Sunday," said Cherono on Thursday. "I have a plan and my training has been injury free. I have to focus on my own strength and hope my colleague Edna (Kiplagat) will join me and we run as a team."

Her compatriot Kiplagat has been one of the marathon elite for many years.

"It has always been my goal to run in Berlin. I know the course is fast and shall try to run my best ever time," said Kiplagat, whose lifetime best is 2:19:50 and has twice won the World title (2011 and 2013).

However, Berlin race director Mark Milde feels the world record will be under threat, especially from Chicago Marathon champion Tirunesh Dibaba.

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