The Brits made it two from two to sit top of Pool A of the Europe/Africa Zone Group 1 going into the final round-robin tie after Katie Boulter and Johanna Konta won their singles matches.
Boulter’s opponent Valentini Grammatikopoulou also suggested the home judges were not playing fair as the matter cast a shadow over what was a thrilling tie.
Boulter delivered another opening win as she battled hard to triumph 6-3 4-6 6-3 before Konta made sure the tie was in the bag after coming from a set down to beat Sakkari 4-6 6-2 6-3.
Both sides were on the end of calls that looked wrong, but with no Hawkeye in operation the players had no choice but to accept the decision.
Afterwards Sakkari, who is ranked one place higher than Konta at 38, did not hold back in her assessment of the officiating.
“They are terrible,” she said. “Since the first round. They’re the worst I’ve ever seen in my life.
“This is unacceptable. Because we have many players in the top 100, we are playing with poor balls, 9 and 11 change, and with line umpires that have never worked in their life. That’s what I want to say.
“The chair umpires are great, but the line umpires are the worst I have ever seen in my life.
“We are used to playing with very good professionals and we come here, it’s a very high level Fed Cup tie, we need to have good professionals on our court.”
With Hungary beating Slovenia to also make it two from two, whoever wins the best-of-three tie will advance to play the winner of Pool B – either Croatia or Serbia.
Greek second seed Stefanos Tsitsipas had to fight hard before booking his place in the Sofia Open quarter-finals, securing a 7-6 (7-5) 6-4 win over feisty German Jan-Lennard Struff having enjoyed the backing of the Bulgarian crowd.
“For the first time I play as if I was at home,” said 20-year-old Tsitsipas, who reached the semi-finals at the Australian Open last month.
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