The day began with Del Potro coming back from 2 sets to none down for the first time in his career against World #8 Marin Cilic to win in 5 sets: 6-7(4), 2-6, 7-5, 6-4, 6-3 in 4 hours 43 minutes. This is the third time this year Cilic has had a 2-0 set advantage in a five-set match and ended up losing it (Wimbledon quarterfinal against Roger Federer and the USA vs Croatia rubber versus Jack Sock.)
But Delbonis' feat was even more amazing. He had to win a live fifth rubber against a higher ranked opponent, playing at home. The 26-year-old lefty Argentine is ranked 41 in the world and is known as a solid clay court player but he defeated the 37-year-old 6-foot-11 Ivo Karlovic (World #20) in straight sets: 6-3 6-4 6-2. Karlovic leads the tour in aces and has the #2 best serve (behind John Isner) but it was Delbonis who never had his serve broken in the match.
Argentina was in the Davis Cup final in 1981, 2006, 2008, 2011, and 2016, finally winning it for the first time this year. Croatia won it once before in 2005. Last year Great Britain won