French duo Nicolas Mahut and Pierre-Hugues Herbert won the doubles title at the ATP Finals for the first time on Sunday after going through the entire tournament without dropping a set.

Mahut and Herbert beat Raven Klaasen of South Africa and Michael Venus of New Zealand 6-3, 6-4 to complete a near-perfect week at the O2 Arena. The duo lost last year’s final to Mike Bryan and Jack Sock after a Champions tiebreaker that ended 13-11 to the Americans, failing to convert a match point along the way.

Mahut and Herbert were seeded seventh but were the only players — in singles or doubles — to win all three round-robin matches.

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France, second right, pose for the media with their winners trophy as Raven Klaasen of South Africa, left, and Michael Venus of New Zealand who hold their runners up plates as the pose for photographs, following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoKirsty Wigglesworth)

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France, second right, pose for the media with their winners trophy as Raven Klaasen of South Africa, left, and Michael Venus of New Zealand who hold their runners up plates as the pose for photographs, following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoKirsty Wigglesworth)

The French players also won the Australian Open this year to complete a career Grand Slam and were playing at the ATP finals for the fifth straight year.

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Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France celebrate with the trophy as they pose for photographs after defeating Raven Klaasen of South Africa and Michael Venus of New Zealand following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoKirsty Wigglesworth)

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France celebrate with the trophy as they pose for photographs after defeating Raven Klaasen of South Africa and Michael Venus of New Zealand following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoKirsty Wigglesworth)

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France kiss trophy they have won after defeating Raven Klaasen of South Africa and Michael Venus of New Zealand following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoAlberto Pezzali)

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France kiss trophy they have won after defeating Raven Klaasen of South Africa and Michael Venus of New Zealand following their ATP World Finals final doubles tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP PhotoAlberto Pezzali)