Ukiniwabo was ranked second in a 147km race clocking 03h41’32 following a sprint finish with Eritrean winner Habtemchael Daniel.
Rougier-Lagane Gregory from Mauritius clocked third to finish 03h42’10 while reigning Tour du Rwanda and Tropicale Amissa Bongo winner Areruya Joseph finished sixth after clocking 03h42’26.
Other Rwandans Hakiruwizeye Samuel, Munyaneza Didier, Mugisha Samuel and Ruberwa Jean Damascene finished 12th, 14th, 16th and 21st clocking a joint 03h42’26 respectively.
In the general classification, Eritrean Mebrahtom Natnael leads with a total 06h07’39, coming 23 seconds ahead of second-placed fellow countrymate Selemun Zemenfes, 33 seconds ahead of Moroccan Chokri El Medi and 35 seconds ahead of Rwandan Areruya.
Following Thursday’s race, only 73 riders finished the race while 15 abandoned due to various reasons.
The competition reserved for cyclist below the age of 23, organised by Vivendi with technical support for the International Cycling Union heads into its third day on Friday as cyclists will undergo 101.8km criterium race in Yaounde before concluding with the last stage of the tour where cyclists will ride 80.5km from Akono to Yaounde on Saturday.
The best two riders at Tour de l’Espoir earn automatic tickets to participate at the 2018 Tour de l’Avenir in France, a race regarded as the U23 version of the famous Tour de France.
Tour de l’Espoir