In the first United Cup, Great Britain defeated Spain in Australia.
The best-of-five match at the Ken Rosewall Arena was won by Great Britain.
The British number two defeated Albert Ramos-Vinolas 6-3 1-6 6-3.
On Saturday, Britain took a 2-0 lead on the strength of a win by Norrie and a loss by Nuria.
The final doubles rubber is being played by the O'Maras against Jessica and David.
The United States, Germany, and the Czech Republic will face off in the play-offs for the semi-finals.
Evans said that they had had a bit of luck. We did well on the court as well.
We work hard for each other and we pride ourselves on that.
There are six groups of three teams that play in three different cities.
Runners-up in each City Final will advance to the semi-finals with the best record.
Tim Henman's Great Britain beat Australia in their first match.