The Green Group gets going in singles, with Tsitsipas vs Rublev a battle of two top players struggling a little for form in recent months. Rublev takes it in straight sets.
And Novak Djokovic, the favorite to get out of this group and win the whole thing, took care of WTA Finals rookie Casper Ruud.
ATP Tour Finals
Location: Turin, Italy
Dates: Nov. 14 – 21, 2021
Prize money: $5,000,000
Draws: RR 8S – 8D
Monday, Nov. 15, 2021
Singles, Green Group
Doubles, Red Group
 Rajeev Ram (USA) / Joe Salisbury (GBR) def.  Jamie Murray (GBR) / Bruno Soares (BRA) 61 76 (5)
 Pierre-Hugues Herbert / Nicolas Mahut (FRA) def.  Juan Sebastian Cabal / Robert Farah (COL) 76 (1) 64