 Complete the following phrase:  Farah has won 18 doubles titles on the ATP Tour, including two at Masters 1000 level, and became world No. 1 in doubles for the first time on 15 July 2019. He has spent a total of 68 weeks at the top of the doubles rankings, and was year-end No. 1 in both 2019 and 2020. Farah has represented Colombia in the Davis Cup since 2010, as well as at the 