Juan Sebastian Cabal (above) and Robert Farah earn a critical doubles point for Colombia against Argentina.

Juan Sebastian Cabal and Robert Farah win their first doubles match of this year's tournament in Acapulco.

Juan Sebastian Cabal and Robert Farah end their 2019 season with five team titles and a 50-19 record.

Juan Sebastian Cabal and Robert Farah are aiming to lift their sixth trophy of the season this week.

Juan Sebastian Cabal and Robert Farah will meet Raven Klaasen and Michael Venus in the last four at the Nitto ATP Finals.

Juan Sebastian Cabal and Robert Farah are presented the year-end No. 1 doubles trophy at the 2019 Nitto ATP Finals by Chris Kermode, the ATP Executive Chairman and President.

The world's eight leading teams pose for the official 2019 Nitto ATP Finals doubles photo.

Juan Sebastian Cabal and Robert Farah claim their second Grand Slam title at the US Open. The Colombians are accompanied by Cabal's two-year-old son Jacobo.

Juan Sebastian Cabal and Robert Farah beat Marcel Granollers and Horacio Zeballos at the US Open to lift their second Grand Slam title of the season.

Robert Farah and Juan Sebastian Cabal own a 45-13 team record in 2019.

Robert Farah and Juan Sebastian Cabal didn't drop serve in their third-round US Open doubles win.

Juan Sebastian Cabal/Robert Farah extend their Grand Slam win streak to seven matches on Friday at the US Open.

Juan Sebastian Cabal and Robert Farah defeat Nicolas Mahut and Edouard Roger-Vasselin in four hours and 57 minutes to win the Wimbledon men's doubles title.

Juan Sebastian Cabal and Robert Farah extend their winning streak to 10 matches after completing the Eastbourne-Wimbledon double.

Juan Sebastian Cabal and Robert Farah are one match away from their first Grand Slam title.

Juan Sebastian Cabal and Robert Farah beat Maximo Gonzalez and Horacio Zeballos for the Eastbourne title.

Robert Farah/Juan Sebastian Cabal advance on Tuesday in Eastbourne.

Roland Garros 2019. Following a semi-final run in Paris, Colombians Robert Farah and Juan Sebastian Cabal clinch the Wimbledon and US Open titles, as well as the No. 1 ATP Doubles Team Ranking. (Photo by Peter Staples/ATP Tour)

Juan Sebastian Cabal and Robert Farah move into the Roland Garros third round.

Juan Sebastian Cabal and Robert Farah repeat as Rome doubles champions on Sunday.

Defending champions Juan Sebastian Cabal and Robert Farah will face top seeds Lukasz Kubot and Marcelo Melo in the semis.

Juan Sebastian Cabal (far left) and Robert Farah (far right) celebrate their first Barcelona title with their team on Sunday.

Robert Farah, foreground, and Juan Sebastian Cabal advance to the quarter-finals at the Sydney International on Tuesday.

Robert Farah and Juan Sebastian Cabal defeat Rohan Bopanna and Edouard Roger-Vasselin at the US Open on Tuesday.

Robert Farah and Juan Sebastian Cabal converted one of 10 break points in their three-set quarter-final loss to Oliver Marach and Mate Pavic at Roland Garros on Tuesday.