In Pictures: Future stars of Africa at Cali 2015

Paul Jacobus Botha of South Africa in action during the Boys Javelin Throw Final on day five of the IAAF World Youth Championships, Cali 2015 on July 19, 2015 in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Abdul Hakim Sani Brown of Japan, gold medal, Kyle Appel of South Africa, silver medal, and Josephus Lyles of the USA, bronze medal, celebrate on the podium after
winning the Boys 200m Final on day five of the IAAF World Youth Championships, Cali 2015 on July 19, 2015 in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Werner Visser (South Africa) after winning the boys Discus at the IAAF World Youth Championships, Cali 2015 (Photo Credit: Getty Images for IAAF)

USA, South Africa and Canada celebrate on the podium after the Mixed 4x400m Relay on day five of the IAAF World Youth Championships, Cali 2015 on July 19, 2015 in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Richard Yator Kimunyan of Kenya, Davis Kiplangat of Kenya and Tefera Mosisa of Ethiopia in action during the men’s 3000m Final on day five of the IAAF World Youth Championships, Cali 2015 on July 19, 2015 in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Willy Tarbei and Kipyegon Bett at the IAAF World Youth Championships, Cali 2015 / Photo Credit: Getty Images for the IAAF

Celliphine Chepteek Chespol and Sandrafelis Chebet Tuei of Kenya in action during the Girls 2000m Steeplechase final on day three of IAAF World Youth Championships, Cali 2015 on July 17, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Celliphine Chepteek Chespol of Kenya, gold medal, Sandrafelis Chebet Tuei of Kenya, silver medal, and Agrie Belachew of Ethiopia, bronze medal, celebrate on the podium after the Girls 2000m Steeplechase final on day three of the IAAF World Youth Championships, Cali 2015 on July 17, 2015 in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Wogene Sebisibe of Ethiopia and Geofrey Rotich of Kenya in action during round one of the Boys 2000 Meters Steeplechase on day three of the IAAF World Youth Championships, Cali 2015 on July 17, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Marta Zenoni of Italy and Gadese Ejara of Ethiopia lead the field during the Girls 800 Meters Semi Final on day three of the IAAF World Youth Championships, Cali 2015 on July 17, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Kumari Taki and Lawi Kosgei of Kenya celebrates after the Boys 1500m Final on day three of the IAAF World Youth Championships, Cali 2015 on July 17, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Celliphine Chepteek Chespol of Kenya, gold medal, celebrates on the podium after the Girls 2000m Steeplechase final on day three of the IAAF World Youth Championships, Cali 2015 on July 17, 2015 in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Shuru Bulo of Ethiopia, Gold medal, Emily Chebet Kipchumba of Kenya, Silver medal, and Sheila Chelangat of Kenya, Bronze medal, in action during the Girls 3000m Final on Day One of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Carli Petri Nieuwenhuizen of South Africa in action during qualification for the Girls Javelin Throw on day one of the IAAF World Youth Championships Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Kumari Taki of Kenya in action during round one of the Boys 1500m on day one of the IAAF World Youth Championships Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Shuru Bulo of Ethiopia celebrates with the Ethiopian flag after the Girls 3000 Meters Final on day one of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Shuru Bulo of Ethiopia, in action during the Girls 3000 Meters Final on day one of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Dalila Abdulkadir Gosa of Bahrain and Bedatu Hirpa of Ethiopia in action during round one of the Girls 1500 Meters on day two of the IAAF World Youth Championships, Cali 2015 on July 16, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Buda Mendes/Getty Images for IAAF)

Emily Chebet Kipchumba of Kenya in action during the Girls 3000 Meters Final on day one of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)

Shuru Bulo of Ethiopia, gold medal, Emily Chebet Kipchumba of Kenya, silver medal, and Sheila Chelangat of Kenya, broze medal, celebrate on the podium after the Girls 3000 Meters Final on day one of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia. (Photo by Patrick Smith/Getty Images for IAAF)