Tennis news - Katie Boulter and Cameron Norrie open Hopman cup with victory for Great Britain

The Australian tournament's round-robin format comprises of national teams competing in two singles and a mixed-doubles match, with eight nations competing across two groups.

23-year-old Norrie, who is ranked 91st in the world, secured a straight-set victory over world no.15 Stefanos Tsitsipas by 7-6 (10-8), 6-4.

Boulter, who will hope to qualify for her first grand slam at the Australian Open in January, was unable to see off competition from Maria Sakkari in the women's singles rubber, losing 6-0, 4-6, 6-2.

However, the pair won the mixed-doubles 4-3, 3-4 (2-5), 4-3 (5-4), to win the round.

They will next face Swiss team Roger Federer and Belinda Bencic on Sunday before facnig Serena WIlliams and Frances Tiafo, representing the USA on Thursday. The winner of each gruop will compete in the final on Saturday

Cameron Norrie (GBR) d Stefanos Tsitsipas (GRE) 7-6(8) 6-4

Maria Sakkari (GRE) d Katie Boulter (GBR) 6-0 4-6 6-2

Boulter / Norrie (GBR) d Sakkari / Tsitsipas (GRE) 4-3 3-4(2) 4-3(4)

Ash Barty (AUS) d Alize Cornet (FRA) 7-5 6-3

Matt Ebden (AUS) d Lucas Pouille (FRA) 3-6 7-6(5) 6-2

Cornet /Pouille (FRA) d Barty / Ebden (AUS) 4-3(4) 4-2

.