Nikolay Davydenko battled back from a set down to beat Eduardo Schwank and pull Russia back level at 2-2 in their Davis Cup quarter-final showdown with Argentina on Sunday.
Davydenko, 29, won 4-6, 6-3, 6-1, 6-4 his first ever meeting with Schwank on the hardcourt of Moscow's Olympic indoor stadium in two hours 43 minutes.
"I felt no pressure today as after being beaten in my previous matches in Moscow I had nothing else to lose," Davydenko said.
"Though I won I'm disappointed with my playing this weekend. I was playing much better and with much more confidence in my previous Davis Cup matches. I was even thinking of withdrawing from playing on Sunday.
"I started poorly today but luckily I managed to find my tennis later in the match and win to level the score."
The local favourite, who is currently sixth in the world, started nervously producing a catalogue of unforced errors allowing Schwank to break early for a comfortable 3-1 lead, which he kept through for a one-set advantage in 38 minutes.
In the second set Davydenko broke in the eighth game to pull the scores level at one set all after one hour 28 minutes on court.