Manangoi siblings Elijah and George dominated the opening day of Athletics Kenya track and field championships at Kasarani.
The brothers will be facing off in the 1,500m in the chase for the title.
Elder brother Elijah is the reigning world 1,500m champion while his young brother is the reigning world under 20 1,500m champion.
In other results, Sheila Chelanga of Kenya Police won the 5,000m in her heat in 15:33.50 ahead of World Under-20, 5000m champion Beatrice Chebet (15:33.86) as Sheila Chepkirui of the Kenya Defence Forces came third in 15:34.68.
Former Commonwealth Games 5,000m champion Mercy Cherono, making a return to the track after a long hiatus, finished fourth to qualify for the final after posting 15:36.54. Cherono was satisfied with her performance and exuding on building on it during the final.
Dorcas Kimeli of Kenya Defence Forces was victorious in the second heat posting 15:35.0 with Eva Cherono of South Rift placed second in 15:37.72.
Kenya Police’s Janet Khisa took the final podium position in 15:40.18 with Edna Cherotich fourth in 15:52.63. Bernadette Mbithe completed the top five places in 16:02.49.
Kimeli expects a competitive final based on the quality of athletes who have entered the race and times posted. In the 200m heats, Nelly Chepkosgei topped Heat One registering 26.23 with Damaris Imbongo finishing second in 26.25. Mercy Chebet came third in 26.90.
Joan Cherono won heat two in 24.93 as Patricia Isichi (26.65) and Emmaculate Akoth (27.13) placed second and third respectively. Eunice Kadogo showed her class in Heat 3, posting 24.82 as Maurine Cherono came second in 25.48 and Susan Nyambura third in 25.87.
Millicent Ndoro was the fastest in the heats as she clocked 23.83 to win Heat 5. Naomi Kiplangat came home second in 25.57 as Damaris Akoth finished third in 26:05.