Great Britain face a Davis Cup relegation play-off after losing their first-round tie 3-2 against Japan.
With the tie level at 1-1 after Friday's opening day, Britain took the lead when Neal Skupski and Joe Salisbury won Saturday's opening rubber 7-6 7-6 against Yosuke Watanuki and Takeru Yuzuki.
But Jacob Fearnley, who beat former world number four Kei Nishikori on Friday, was beaten 6-3 7-6 by Yoshihito Nishioka to force a decider.
The experienced Nishikori, 35, then cruised past Billy Harris 6-2 6-3 in an hour and 15 minutes to seal victory for the hosts in Miki, Japan.