Croatia and France face-off in the semi-final of the 2016 Davis Cup on 16 September.
Andy Murray and Del Potro clash as Great Britain face Argentina in the semi-final of 2016 Davis Cup.
India host Spain in the 2016 Davis Cup tie on 16 September.
India take on Spain in the world group play-off tie in the 2016 Davis Cup.
Duo set to renew hostilities in Glasgow after meeting in the Olympic singles final in August.
Leon Smith's side return in September to the scene of their wins over USA and Australia in 2015.
World number 67 wins in straight sets at Tasmajdan Stadium in Belgrade.
Victory for Kyle Edmund over Dusan Lajovic on Sunday will see Britain progress to semi-final.
British number three defied the elements to secure his maiden Davis Cup win at Tasmajdan Stadium.
Andy Murray is unsure of his participation in the upcoming 2016 Davis Cup quarter-final against Serbia.
The 28-year-old star is facing a very busy playing schedule for the rest of the year.
Leon Smith's defending champions will take on Novak Djokovic and co at the 6,100-capacity Tasmajdan Stadium.
The world number 57 is now a UK citizen but previously played in three singles rubbers for Slovenia.
The Scot has been in charge of the team since 2010 and led them to the trophy in 2015.
The 28-year-old Scot maintained his unblemished record this week with a thrilling victory.
The 25-year-old Brit may be needed to seal victory at the Barclaycard Arena in Birmingham.
The two best players on show go head-to-head at the Barclaycard Arena in Birmingham.
Scottish duo combined to defeat the Japanese pair of Nishioka and Uchiyama in Birmingham.
The tie is delicately poised following the first round at the Barclaycard Arena in Birmingham.
The world No6 too strong for the Birmingham player to leave the tie at 1-1 after day one.
The 28-year-old Scot made light work of his little-known opponent at the Barclaycard Arena in Birmingham.
Great Britain begin the defence of their Davis Cup crown against Japan at the Barclaycard Arena in Birmingham.