"Physically I'm not at my best, but I knew for the team and the fans that I had to leave my heart out on the court", Goffin said in his on-court interview.
The world No.12 was made to work hard for his victory by the 185th-ranked Queenslander, who was only called into the team by Hewitt on Thursday. His most recent loss at the U.S Open caused by a lack of movement thanks to knee soreness. 'It's always important in Davis Cup'. It made a difference to take the next two sets and the last was justified.
Darcis, who famously beat Rafael Nadal at Wimbledon in 2013, is ranked number 77 in the world and owns a 21-8 singles record. It was the first time Australia had won the Hopman Cup since 1999.
It was the first five-set singles win of Kyrgios' Davis Cup career.
"Davis Cup has done wonders for me this year".
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Aussie coach Lleyton Hewitt explained the switch, telling the Davis Cup's official website: "John is match hardened, he's played a lot of five-set tennis, particularly in NY".
"(Captain) Lleyton Hewitt and I have put so much dedication into this, the Davis Cup has been my No.1 priority this year.
"We've known each other for a very long time, so that makes getting down together at the same end of the court pretty easy", Peers said.
France last reached the Davis Cup final in 2014, losing to Switzerland. At the Rio 2016 Olympics, winning his opening match 6-0 6-0, the first man to do so.
In Davis Cup, they can at least be confident of something approaching a full-blooded performance from Kyrgios, who loves the team aspect of the competition and played a leading role in Australia's quarter-final victory over the United States in April.
Peers, part of the world No.1 doubles team with Finland's Henri Kontinen, will play in the crucial second-day rubber on Saturday in Brussels.
He says his desire to lead "a normal life" is in conflict with his hunger to win tour matches, but rejected comparisons with another disaffected Australian player, Bernard Tomic.