Three-time Olympic champion Tirunesh Dibaba of Ethiopia and Kenya’s Joyciline Jepkosgei are set to enhance the competitive flavour of the Airtel Delhi Half Marathon to be held here on October 21. Dibaba’s opponent, Jepkosgei, who is also the current world half marathon record holder, sounded equally confident. “I’m very happy to be here – it’s a privilege to meet Indian …