Emma Raducanu lost on her return from a foot injury as Great Britain were eliminated from the United Cup with a group-stage defeat by Greece.
Raducanu, 23, had not played since early October after what she described as "light bone bruising" on her right foot and pulled out of her anticipated season-opening match against Japan's Naomi Osaka on Monday due to the same issue.
With the decision deemed to be precautionary, Raducanu returned to court on Tuesday for a tie in which victory would have secured Britain's place in the quarter-finals.
There were encouraging signs for Raducanu in a 6-3 3-6 6-1 defeat by Greece's Maria Sakkari - moving freely in a thorough workout, often striking the ball with quality and showing fighting spirit to level the match.