Eritrean distance runner Dawit Seare shocked Norwegian favourite Jakob Ingebrigtsen to snatch the 5km gold at the World Road Running Championships in Copenhagen on Saturday.
Two-time Olympic and world champion Ingebrigtsen finished second in a very fast-paced race through the streets of the Danish capital.
Ingebrigtsen, 26, had remained hidden in the leading pack, trailing over 10 metres behind his rival at one point.
The 21-year-old Seare took the lead about 1km from the finish.
Ingebrigtsen, who won European gold in August and the Ultimate 5 000m title last week after returning from injury, attempted a late surge past a grimacing Seare with the finish line in sight.
But African 5 000m champion Seare held on to cross in 12 minutes 56 seconds with Ingebrigtsen second in 12:59 and another Eritrean, Saymon Amanuel, 19, third in 13:00.
Ethiopian Likina Amebaw won the women's 5km in 14:41 ahead of Kenyan Caroline Makandi Gitonga (14:48) and Australian Rose Davies (14:50). South Africa's Tayla Kavanagh was fourth in 14:51.