Rory Loy scored his third goal in four games to give United the lead in the 51st minute at Fratton Park. Portsmouth were able to save a draw after Mark Gillespie brought down John Akinde in the box on 78 minutes, Liam Walker converted the penalty. Neither side was able to find a way to win.
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More than 100,000 Rugby fans are expected in the city this weekend as St James' Park hosts its final match World Cup match.
Mainly dry, odd shower - feeling cooler on Sunday
What has the weekend weather got in store for the Border region?