Read our Privacy noticeDefending London Marathon champion Sabastian Sawe is set to return to the event on 26 April and the Kenyan believes he may need to break the course record to retain his title. "The TCS London Marathon course is one of the most beautiful and fastest in the world," Sawe said. open image in gallery Sabastian Sawe has the London Marathon course record in his sights ( Getty Images )The late Kiptum's mark stands at two hours one minute and 25 seconds. Sawe's winning time last year of 2:02:27 was the second fastest time ever on the London Marathon course. The women's field, unveiled on Wednesday, features reigning champion Tigst Assefa of Ethiopia, world champion Peres Jepchirchir of Kenya and Olympic champion Sifan Hassan of the Netherlands.