Former world number one Andy Murray has revealed how a "mild" groin injury forced him to sit out much of the Davis Cup.
Roger Federer has no plans to bring his career to an end, though the 38-year-old admitted he is relishing the freedom retirement will bring.
A crowd of 42,217 watched an exhibition match between Roger Federer and Alexander Zverev in Mexico City on Saturday.
Kyle Edmund will once again play in the singles for Great Britain, meaning Andy Murray will be a spectator for their quarter-final tie.
Alex de Minaur's comeback win was not enough to inspire Australia, as Canada became the first team to book a semi-final berth in Madrid.
Spain will be without Roberto Bautista Agut for the rest of their Davis Cup campaign after the world number nine's father died.
He may have won 20 grand slams, but Roger Federer is still motivated, even at 38.
The history-making Stefanos Tsitsipas surprised himself with the way he blew Dominic Thiem away in the second set of a classic final.
After winning the ATP Finals, Stefanos Tsitsipas feels grand slam success is not far away.
Stefanos Tsitsipas and Dominic Thiem served up a thriller at the O2 Arena and it was the Greek who came out on top to make history.