Regular doubles partners Leonardo Mayer and Carlos Berlocq claimed a valuable doubles victory to hand Argentina a 2-1 lead heading into the final day of their Davis Cup semi-final against Belgium.
The South American duo beat Ruben Bemelmans and Steve Darcis 6-2 7-6 (7-2) 5-7 7-6 (7-5) in a four-hour contest in Brussels on Saturday.
On Friday, David Goffin gave Belgium a 1-0 lead after beating Federico Delbonis, but Mayer hit back for the visitors by edging Steve Darcis.
And Mayer was again in the thick of it as he teamed up with Berlocq to grind out the hard-fought doubles victory.
There was little to separate the two teams in the winners, unforced errors or break points earned columns, but ultimately the Argentines won the points that mattered.
Argentina are one win from reaching their fifth Davis Cup final and Mayer can potentially clinch it for his country when he takes on David Goffin in the first of Sunday's reverse singles matches.
If not, it will be left to Darcis and Delbonis to decide the semi-final.