British fans have been urged to act "like a football crowd" to push their Davis Cup team towards the knockout stage of the men's team competition.

Britain play Argentina in Manchester on Friday and Canada on Sunday, as they look to progress from the group stage.

On Wednesday, they won 2-1 in their opening tie against Finland.

But, in a round-robin format where the margins are tight, Britain could be left to rue not being able to clinch a clean sweep in the best-of-three contest.

After singles wins for Dan Evans and Billy Harris, Evans and Neal Skupski were narrowly beaten in the deciding doubles by Finnish pair Harri Heliovaara and Otto Virtanen.

The atmosphere among a crowd of just over 6,000 - in a 24,000-capacity arena where the upper tier was curtained off - was muted at times during the doubles.

"I urge those coming on Friday and Sunday to empty the tank," said British captain Leon Smith.

"You see it at the French Open, it's like a football crowd. It makes a difference at the end of a long day.

"It was really quiet out there and we have to make the most of that home advantage."