Andy Murray will take on former US Open champion Juan Martin del Potro in the opening match of defending champions Great Britain's Davis Cup semi-final against Argentina in Glasgow on Friday.
Murray, the world number two, will play Del Potro at 13:00 BST, followed by Kyle Edmund against Guido Pella.
Del Potro, ranked 64th in the world as he makes his way back from injury, lost to Murray in August's Olympic final.
Andy and Jamie Murray will play together in Saturday's doubles match.
GB captain Leon Smith opted to leave doubles specialist Dom Inglot out of his final four to give himself another singles option for Sunday's final matches in Dan Evans.