Belarusian Daniil Ostapenkov, a teenager who had not played professional-level match before, stunned world number 15 Diego Schwartzman 6-4 6-3 in their World Group I Davis Cup match against Argentina on Saturday.
Ostapenkov fired down three aces and saved seven break points to defeat Schwartzman on his home turf at the Buenos Aires Lawn Tennis Club, although Guido Pella levelled the tie at 1-1 with a win over Erik Arutiunian. Slovakia completed a 3-1 win over Chile with Norbert Gombos thrashing world No 17 Cristian Garin 6-0 6-1 for his second win of the tie in Bratislava.
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