Dan Evans put Great Britain ahead in their Davis Cup tie against Uzbekistan with victory over Denis Istomin in a gripping opening singles rubber.
Playing for Great Britain for the first time since returning from a 12-month drug ban, Evans beat world number 60 Istomin 7-6 (7-4) 4-6 0-6 6-4 7-5.
Cameron Norrie takes on Jurabek Karimov in Friday's second singles rubber.
A doubles match follows on Saturday before Sunday's reverse singles in the best-of-five-match tie in Glasgow.
With a revamped Davis Cup being introduced next year, this tie is no longer about relegation from the elite World Group.