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Victory for Great Britain will secure a quarter-final place and World Group status in 2017. Dan Evans may be needed to secure an all-important point for the hosts at the Barclaycard Arena.
Where to watch
Coverage of the third and final day of the Davis Cup tie gets underway on BBC One from 1pm.
Evans was a late replacement for the injured Kyle Edmund in the Great Britain team for the crucial clash in Birmingham. The 25-year-old lost his opening game on Friday against the Japanese number one Kei Nishikori (6-3 7-5 7-6 (7-3)), but delivered a credible performance nevertheless against his heavily-fancied opponent.
And if he is able to deliver a similar performance against Taro Daniel, he will stand a good chance of securing an all-important point for his country. Evans is also looking forward to playing in front of his home crowd in Birmingham.
"I think the crowd have been really good this week," he said during a pre-match press conference. "Yeah, it was just like all of the other Davis Cup ties I've played, I thought the crowd were excellent. Obviously, it is special playing at home and being with the guys in Birmingham. It is special, but is is also like every other week. With these guys, I always enjoy myself and they make me feel welcome."
Evans also insisted he would have no issues with having to win the final game to help retain the Davis Cup for Britain. "I will just go out there and play my game," he said. "I think that's all Leon Smith asks - and that's all the rest of the team ask.
"Every time we leave the changing room, the last thing Leon says is to do your best. And that's pretty much what everyone ... that's the motto within the team. There's no pressure on anyone to do anything special or anything. We just work hard for each other."
If Britain are able to beat Japan they will face either Kazakhstan or Serbia, led by world number one Novak Djokovic, in the next round of the Davis Cup.
Pre-tie betting odds
- Great Britain: 2/9
- Japan: 3/1