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
2.
Leading 2-0 after Friday's singles, Colin Fleming and Ken Skupski eased to a 6-3 6-4 6-4 win against Ergun Zorlu and Haluk Akkoyun in Eastbourne.
BBC: Great Britain seal Davis Cup win over Turkey
3.
Haluk Bilginer is a huge star in Turkey and can't go anywhere without hoards of fans chasing him for an autograph, a photograph or a shake of the hand.