Sydney [Australia], January 3 (ANI): Diego Schwartzman delivered the knockout blow for Argentina Monday at ATP Cup as he earned the third Top 5 win of his career, edging World No. 4 Stefanos Tsitsipas 6-7(5), 6-3, 6-3 to seal Argentina's victory against Greece in Group D on Monday. Schwartzman is making his third ATP Cup appearance this week and now holds a 4-4 singles record at the tournament. Argentina will face Poland