Any candidate who wins more than half of the votes cast is considered the victor.
Ortega has ruled Nicaragua for 20 of the past 37 years.
The number killed in the days of chaos after the results were made public is disputed.
Security forces surrounded the opposition headquarters overnight and stormed the building.
Such TV debates are rare in Africa.
Uganda’s oldest political parties, UPC and DP did not field candidates
Sign up to receive our free newsletter