Great Britain's place in next year's Davis Cup qualifiers remains uncertain after Wimbledon champions Julian Cash and Lloyd Glasspool were stunned in the doubles by Poland's Karol Drzewiecki and Jan Zielinski.
The world number one pairing, making their Davis Cup debuts together, could have given Britain an unassailable 3-0 lead in the tie in Gdynia but went down 3-6 6-3 7-6 (8-6) to the Polish duo.
The result means the onus will be on British number two Cameron Norrie to book his country's place in February's first round, with Britain's lead trimmed to 2-1 in the best-of-five tie.