Another error in the fourth game of the third set from Ilhan saw the Turk broken again.

BBC: Great Britain close in on Davis Cup victory

And Ilhan went on to take the third set in style with a 7-0 whitewash in the tie-break.

BBC: Great Britain close in on Davis Cup victory

And they will wrap up the tie on Saturday if Colin Fleming and Ken Skupski beat Ilhan and Haluk Akkoyun in the doubles.

BBC: Great Britain close in on Davis Cup victory

Turkey's best player, Marcel Ilhan, is currently the world number 119 and would therefore be the favourite to win both of his singles rubbers.

BBC: Andy Murray opts out of Davis Cup tie against Turkey

The latest example is the arrest of Ilhan Cihaner, a public prosecutor in the province of Erzincan, for alleged links to an illegal ultra-nationalist gang.

ECONOMIST: Turkey's coup plotters

Ward, also 23, followed up with a surprisingly easy 6-2 7-5 6-7 (0-7) 6-1 success against Marsel Ilhan, who is ranked almost 200 places above him.

BBC: Great Britain close in on Davis Cup victory

Ward, ranked 301 in the world, had beaten Ilhan twice in ATP qualifying events but was expected to be given a tougher workout by the higher-ranked player.

BBC: Great Britain close in on Davis Cup victory

Although Ilhan broke back, Ward broke once again and then held serve before sealing victory in the seventh game when he forced Ilhan into making an error on his forehand.

BBC: Great Britain close in on Davis Cup victory

The 23-year-old then had two match points on Ilhan's serve, but the first was saved after the Briton's forehand was too long before the Turk saved the second with an ace.

BBC: Great Britain close in on Davis Cup victory

Turkey's chances were not helped when key player Marsel Ilhan, who lost to Ward in the singles on Saturday, opted to pull out before the game due to mental and physical tiredness.

BBC: Great Britain seal Davis Cup win over Turkey