The top two teams in each group advance to the semi finals.
Oliver Marach and Mate Pavic, who have clinched the year-end No. 1 ATP Doubles Team Ranking lead Group Knowles/Nestor.
Henri Kontinen and John Peers, winners of the ATP Finals title for the past two years, will serve as doubles alternates at the season finale.
It's a lucrative end to the season for Venus who has so far earned $543,000 US dollars in prize money after reaching the Wimbledon final and final of the Toronto Masters 1000 tournament. Each pair earn $100,000 USD as an appearance fee in London with $38,000 US for each round robin win. A semi final match win would earn $103,000USD and winning the final $200,000.
Going through the tournament unbeaten would earn the pair $517,000 USD.
Doubles – Group Knowles/Nestor
[1] Oliver Marach (AUT) / Mate Pavic (CRO)
[3] Lukasz Kubot (POL) / Marcelo Melo (BRA)
[5] Mike Bryan (USA) / Jack Sock (USA)
[6] Pierre-Hugues Herbert (FRA) / Nicolas Mahut (FRA)
Doubles – Group Llodra/Santoro
[2] Juan Sebastian Cabal (COL) / Robert Farah (COL)
[4] Jamie Murray (GBR) / Bruno Soares (BRA)
[6] Raven Klaasen (RSA) / Michael Venus (NZL)
[7] Nikola Mektic (CRO) / Alexander Peya (AUT)