"Koech, who is still only 17 years old, was competing in his first ever indoor race and only his second 5000m race to date. But that did not stop him from obliterating the world junior indoor best, chopping almost 40 seconds from the previous mark (Ismael Kirui’s 13:32.90) and defeating former world champion and two-time Olympic medallist Eliud Kipchoge.
"Koech’s time is the second fastest junior 5000m performance under any conditions, behind Kipchoge’s outdoor world junior record of 12:52.61. Koech and Kipchoge became the fourth and fifth men in history to break 13 minutes for 5000m indoors, behind Kenenisa Bekele, Haile Gebrselassie and Daniel Komen – pretty esteemed company for the young Kenyan to be in!"
http://www.athleticsweekly.com/news/collins-rolls-back-the-years-koech-smashes-world-junior-indoor-best-in-dusseldorf/