World No. 20 Nick Kyrgios narrowly edged Steve Darcis, 33, to make it a win apiece between Australia and Belgium in the Davis Cup World Group semi-finals.
The Australian created a comeback after just over three hours and a half of action 6-3 3-6 6-7 (5) 6-1 6-2.
Darcis refused to back down after losing the opener as he went on take the following two sets.
However, a clearly-inspired Kyrgios had no interest in letting Australia fall 0-2 down to Belgium after Day 1, taking dominantly the fourth and fifth set.
Kyrgios, 22, fired 34 aces and 41 winners, as well as broke Darcis six times during the match.
The 22-year-old has remained perfect this year in Davis Cup as he hasn't lost a match so far.
Earlier today, Belgium's David Goffin managed to hold off world No. 185 John Millman 6-7 (4) 6-4 6-3 7-5.
Goffin, 26, lost the first set after failing to serve out for the opener in the 12th game of the set.
Millman was then quick to break Goffin but the Belgian recovered from being down by a break to make it all a set apiece.
Goffin then without many problems took the third set, before he saved a break point in the 12th game of the fourth set to close out the match eventually.
Goffin clearly didn't have a great day at the office, firing 28 winners and 81 unforced errors.
However, he managed to hit 16 aces and convert 11-of-17 of his break point tries in three hours and 29 minutes of play.
Kyrgios is scheduled to meet Goffin on Sunday, while Millman is set to off against Darcis the same day, respectively.