Pierre-Hugues Herbert celebrates winning the Nitto ATP Finals doubles title.

Nicolas Mahut and Pierre-Hugues Herbert celebrate capturing the title at the Nitto ATP Finals.

Pierre-Hugues Herbert and Nicolas Mahut share a moment with Michael Venus and Raven Klaasen following the Nitto ATP Finals doubles trophy ceremony.

Nicolas Mahut and Pierre-Hugues Herbert are the first team to win the Nitto ATP Finals title without dropping a set since 2015.

Nicolas Mahut and Pierre-Hugues Herbert extend their winning streak to nine matches after winning the Nitto ATP Finals championship match on Sunday.

Pierre-Hugues Herbert and Nicolas Mahut are the first French team to lift the Nitto ATP Finals trophy since 2005.

Pierre-Hugues Herbert and Nicolas Mahut are competing at the Nitto ATP Finals for the fifth straight year.

Nicolas Mahut and Pierre-Hugues Herbert own a 2-0 team record in finals this year.

Nicolas Mahut and Pierre-Hugues Herbert are aiming to become the first French team since 2005 to lift the Nitto ATP Finals trophy.

Pierre-Hugues Herbert and Nicolas Mahut have not dropped a set since arriving at the Rolex Paris Masters last month.

Nicolas Mahut and Pierre-Hugues Herbert go unbeaten in round-robin play at the Nitto ATP Finals.

Nicolas Mahut and Pierre-Hugues Herbert finish Group Max Mirnyi with a 3-0 record.

Nicolas Mahut and Pierre-Hugues Herbert own a 16-5 record as a team this year.

Pierre-Hugues Herbert and Nicolas Mahut reach the last four at the Nitto ATP Finals for the second straight year.

Pierre-Hugues Herbert and Nicolas Mahut win their first match in Group Max Mirnyi at the Nitto ATP Finals.

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

Nicolas Mahut/Pierre-Hugues Herbert win their home ATP Masters 1000 title on Sunday in Paris.

Nicolas Mahut and Pierre-Hugues Herbert are aiming to lift their first Rolex Paris Masters title this week.

Nicolas Mahut and Pierre-Hugues Herbert have won six ATP Masters 1000 crowns as a team.

Andy Murray and Pierre-Hugues Herbert were unable to break serve in their second-round Wimbledon loss.

Andy Murray and Pierre-Hugues Herbert prevail in their debut match as a team.

Pierre-Hugues Herbert is through to his third ATP Tour semi-final of 2019.

Frenchman Pierre-Hugues Herbert reaches the second round at Roland Garros for the third consecutive year.

Pierre-Hugues Herbert slides in for a volley against Kei Nishikori at the Rolex Monte-Carlo Masters en route to his third Top 10 win on Wednesday.

Nicolas Mahut and Pierre-Hugues Herbert survive a first-round test at the BNP Paribas Open.