The 36-year-old has won in London and NY three times each, and last year ran faster than Radcliffe had ever done in a women's-only race, scampering away from a stacked field in London after the first mile before finishing in 2hr 17 min 01 sec.
This time she will have three male pacemakers around her for the first time, which should enable her to take serious aim at Radcliffe's overall world record of 2:15.25, which was set with the help of male runners, in 2003.
"But I will try to follow in the footsteps of the legend, Paula, on Sunday".
"It is not easy - 2:15 is something else", Keitany said here.
"It's a good feeling but when I turn out I am going to give it 110% and see what I can do". Break it down at Record Store Day this Saturday, taking place across London at the capital's best independent vinyl shops, or be one of the first to see the new Fashioned from Nature exhibition at the V&A.
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"This is the biggest race", said Farah, who finished in 2:08:21 in 2014. "I am ready for the race on Sunday".
"After the pacemaker dropped out, I just went alone to the finish line", Keitany told reporters after last year's race. Dibaba, who finished second past year in an Ethiopian national record of 2:17:56, said she was also well-prepared, and like Keitany, played down the significance of the male pacers. The other key women in the race-Kenya's Vivian Cheruiyot and Gladys Cherono, Bahrain's Rose Chelimo, and Ethiopia's Tirunesh Dibaba and Tigist Tufa-were mute when asked today if they planned to try to stay with Keitany.
"I understand the marathon more, so I will go after the British record and see what I'm capable of". Now [in the marathon] there are a lot of guys who can run a lot faster than me.
Although the weather will likely be unseasonably warm here on Sunday (between 16 and 19C during the elite women's race according to the BBC), Keitany doesn't think that it would be too hot for her.
"My son was 12 at the time and we started to go to park runs, but I found out quite quickly that I couldn't keep up with him". I hope there will be a systematic pace.