Keitany, Vivian draw battle lines: London Marathon champion Cheruiyot ready for the challenge

Kenya's Mary Keitany runs during the women's elite race at the London marathon on April 23, 2017 in London. Kenya's Mary Keitany won a third London Marathon today posting an unofficial time of 2hrs 17min 01sec -- the fastest time in a women-only marathon. / AFP PHOTO

Three-time New York Marathon champion chases fourth title in Sunday race

Two-time London marathon champion Mary Keitany will be seeking to clinch the New York City Marathon for the fourth time on Sunday.