- Argentina reaches Davis Cup final
- Beats holder Great Britain 3-2
- Leonardo Mayer wins deciding rubber
- Will play Croatia for the title
Mayer stepped in for the exhausted del Potro for the fifth and deciding match of the tie against Dan Evans, with the teams tied at two wins apiece.
Despite falling behind to Evans, the 29-year-old Argentinian recovered to win 4-6 6-3 6-2 6-4, justifying the decision of team captain Daniel Orsanic to field him ahead of the Olympic silver medalist.
Evans was also playing his first rubber of the tie, replacing Kyle Edmund for the reverse singles, but could not match the inspired play of his opponent, who has an 11-3 record in Davis Cup matches.
The enthusiastic crowd in Glasgow had been in optimistic mood after Murray, beaten by del Potro in a five-set and five-hour-plus classic Friday, showed his fighting quality with a straight-sets win over Guide Pella to level the score at 2-2.