Group A
Greece (1) defeated Bulgaria (16) 4-1
Maria Sakkari (Greece) defeated Viktoriya Tomova (Bulgaria) 6-3 6-2
Dimitar Kuzmanov (Bulgaria) defeated Michail Pervolarakis (Greece) 6-1 6-1
Maria Sakkari / Stefanos Tsitsipas (Greece) defeated Gergana Topalova / Adrian Andreev (Bulgaria) 6-4 6-4
Group B
Switzerland (9) defeated Kazakhstan (13) 5-0
Stan Wawrinka (Switzerland) defeated Alexander Bublik (Kazakhstan) 6-3 7-6(3)
Jil Teichmann (Switzerland) defeated Zhibek Kulambayeva (Kazakhstan) 6-3 6-2
Jil Teichmann / Marc-Andrea Huesler (Switzerland) defeated Zhibek Kulambayeva / Alexander Bublik (Kazakhstan) 7-6(7) 6-3
Group C
USA (3) defeated Czechia (14) 4-1
Petra Kvitova (Czechia) defeated Jessica Pegula (USA) 7-6(6) 6-4
Frances Tiafoe (USA) defeated Tomas Machac (Czechia) 6-3 2-4 (retired)
Jessica Pegula / Taylor Fritz (USA) defeated Marie Bouzkova / Jiri Lehecka (Czechia) 2-6 6-3 10-7
Group D
Great Britain (15) defeated Australia (7) 3-2
Harriet Dart (Great Britain) defeated Maddison Inglis (Australia) 6-4 6-4
Jason Kubler (Australia) defeated Daniel Evans (Great Britain) 6-3 7-6(3)
Samantha Stosur / John Peers (Australia) defeated Harriet Dart / Jonny O’Mara (Great Britain) 7-6(4) 6-4
Group E
Italy (5) defeated Brazil (11) 3-2
Matteo Berrettini (Italy) defeated Thiago Monteiro (Brazil) 6-4 7-6(7)
Lucia Bronzetti (Italy) defeated Laura Pigossi (Brazil) 6-0 6-2
Luisa Stefani / Rafael Matos (Brazil) defeated Camilla Rosatello / Matteo Berrettini (Italy) 6-4 6-7(4) 10-4
Group F
France (6) defeated Argentina (17) 5-0
Caroline Garcia (France) defeated Nadia Podoroska (Argentina) 6-2 6-0
Adrian Mannarino (France) defeated Federico Coria (Argentina) 6-1 6-0
Caroline Garcia / Edouard Roger-Vasselin (France) defeated Nadia Podoroska / Tomas Martin Etcheverry (Argentina) 6-2 6-4