Leylah Fernandez, Canadian teammates eliminated at United Cup by Greece

Maria Sakkari and Stefanos Tsitsipas helped Greece eliminate Canada from the United Cup with a 3-0 victory in group play on Wednesday in Perth, Australia.

Sakkari saved four set points in the first set and came back from down 3-1 in the second to defeat Leylah Fernandez of Laval, Que., 7-6 (2), 6-3, and secure a 2-0 lead for Greece, which advanced to the quarterfinals.

In the first match, No. 6-ranked Tsitsipas comfortably beat Toronto's Steven Diez 6-2, 6-3.

Tsitsipas's brother, Petros, and Despina Papamichail teamed to top Montreal's Felix Auger-Aliassime and Vancouver's Stacey Fung 7-5, 6-4 in mixed doubles.

WATCH | Tsitsipas, Papamichail complete sweep of Canada:

Canada opened the tournament with a 2-1 win over Chile on Sunday and would have advanced to the quarters as Group B winners with a victory versus Greece.

The Canadians (2-4) instead finished last in the group, behind Chile (3-3) and Greece (4-2).

The 18-country, mixed-team event in Sydney and Perth doubles as a warm-up for the Australian Open.

Novak Djokovic continued to struggle with his wrist injury as Australia stunned Serbia with a 3-0 win in the quarterfinals.

Djokovic, who has had a problem with his right wrist during the tournament, found a way past Jiri Lehecka in Serbia's previous Group E match against the Czech Republic.

However, the world No. 1 struggled against Alex de Minaur as the Australian used a superb defence and a dominant serve to win 6-4, 6-4.

"When you go up against Novak you have to go out and enjoy it and back yourself, and no matter what keep fighting until the end," de Minaur said. "Today was my day and I'm happy that I was able to get the win."

Djokovic was clearly in discomfort against world No. 12 De Minaur and was twice