Karlovic never played this good, like last 3 singles matches.
This is actually his 2nd time made Croatia through, 1st one was vs Brasil in 2008. From that time he has 6:2 in singles (all live rubbers) and 2:2 in doubles.
This is first time Ivo won all 3 points for Croatia. Only Ljubicic (x5), Ancic (x1), Cilic (x1) did it. He is in really nice company. All of them won "live" matches. While Ivanisevic 7 times won all 3 points but 4 time 3rd match was "dead" match. It was "live" - "dead" ratio 1:2 for Croatia and 2:2 for Yugoslavia. Only he didn't lost single set in one tie (9:0 vs germany in 2002).