The year end ATP number one for 2017 will be Roger Federer or Rafael Nadal

Created by gurgus on 2017-08-09; known on 2017-11-19; judged right by gurgus on 2017-11-20.

• gurgus estimated 100% on 2017-08-09
• gurgus   judged this prediction right on 2017-11-20.