Julian Cash and Lloyd Glasspool were shocked by Polish pair Karol Drzewiecki and Jan Zielinski in the Davis Cup.
Great Britain took a two-match lead into the second day of their Davis Cup tie after Cameron Norrie and Arthur Fery picked up wins on the first day.
Victory appeared likely for Wimbledon winning pair Cash and Glasspool, but they were stunned by a three-set defeat (3-6 6-3 7-6) in Gdynia.
The pair have come under fire from former Davis Cup stalwart Dan Evans after their performance in Poland.
Dan Evans criticises Julian Cash and Lloyd Glasspool after Davis Cup defeat
Evans, who was on broadcast duties for The Tennis Channel during the Davis Cup tie, was far from impressed by what he saw from his compatriots.
“I have to be honest, I thought the British guys together as a team were pretty poor,” said Evans while on commentary.
“They were not as one out there,” he added. “They were not bouncing off each other, not helping each other enough, and the Polish team was a better team.”
Evans was part of the Davis Cup team that saw Great Britain lift the trophy in 2015, alongside Andy Murray, Jamie Murray, and Kyle Edmund.
Norrie has a chance to win the tie for Great Britain against Poland in his singles match against Olaf Pieczkowski.
Great Britain captain Leon Smith was right to talk down ‘straightforward’ Davis Cup tie
Great Britain are the overwhelming favourite to defeat Poland, but Davis Cup captain Leon Smith downplayed the straightforward nature of the tie.
“It doesn’t often work that way,” said Smith in an interview with BBC Sport. “If you look at tennis as a sport, I think more than football in a way, guys ranked 400 or 500, they are playing to a good level.”
“We do go in as favourites, but you have to be very respectful of the opposition, which we are, and very professional, which we have been.”
Great Britain will likely win the tie, but the loss for Glasspool and Cash is proof that anything can happen in the Davis Cup.
