BUENOS AIRES (REUTERS) - Belarusian Daniil Ostapenkov, a teenager who had not played a 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 (Sept 18).

The 18-year-old became the latest young gun to cause an upset following a US Open where teenagers seized the spotlight and 18-year-old Briton Emma Raducanu became the first qualifier to win a Grand Slam title.

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 convincing win over Erik Arutiunian.

Slovakia completed a 3-1 victory over Chile with Norbert Gombos thrashing world number 17 Cristian Garin 6-0 6-1 for his second win of the tie in Bratislava. The Slovaks must now wait to see whether they are automatically into the February qualifiers to reach the 2022 Finals.

Norway were also triumphant with Casper Ruud’s 6-3 6-1 victory over Sanjar Fayziev handing them a 3-1 lead and keeping alive their hopes of reaching the 2022 Finals.

The eight highest ranked winners from the World Group I ties will go into the Davis Cup qualifiers next February where they will attempt to qualify for the 2022 Finals.