Roger Federer’s 2018 tennis season officially began on 30 December 2017, with the start of the Hopman Cup, and ended on 17 November 2018, with a loss in the semifinals of the ATP Finals.He finished the year ranked No. 3 in the ATP Rankings.This season saw Federer improving his career best start to a season at 17–0 (21–0 if including victories at the Hopman Cup).

https://en.wikipedia.org/wiki/2018_Roger_Federer_tennis_season