USA captain Jim Courier, right, talks to Jack Sock of the U.S.at the Davis Cup World Group Quarterfinal in Brisbane, Australia, Friday, April 7, 2017.
For Kyrgios to win all six sets of tennis in his two matches against top-25 players John Isner and Querrey encapsulated the tennis growth this year of the world No.16 since his miserable Australian Open loss.
US team captain Jim Courier, left, talks to his players during the doubles match between Australia's Sam Groth and John Peers, and Jack Sock and Steve Johnson of the U.S.at the Davis Cup World Group Quarterfinal in Brisba.
'I've been playing great tennis. "He's been in good form, I think he's up there with the most wins this season so far", he said of Sock. "He is a proven player and I knew it was going to be tough", Kyrgios said.
Kyrgios was the main event but the day was set up by Thompson, the world No 79 who took down Sock, ranked 15 and the American No 1 in this tie. "I'm trying to knuckle down and compete for every point and that's something I haven't done in the past", he said.
On Sunday on Brisbane's Pat Rafter Arena, Hewitt had tasked his No.1 player with stepping up to the plate and putting the U.S. challenge to bed once and for all.
Nick Kyrgios secured Australia's Davis Cup quarter-final victory over the United States by beating Sam Querrey.
Crowd pullers Novak Djokovic and Nick Kyrgios closed in on a mouthwatering Davis Cup final duel on Sunday but France and Belgium cast themselves in the role of party-poopers.
The young Australian then held strong in the fourth, breaking Sock twice.
Kyrgios said his ability to stay focused during crucial moments where previously his concentration lapsed were critical to his performance in Brisbane this weekend.
Visiting captain Jim Courier gambled on bringing Sock in for Sam Querrey even though the U.S. number one had racked up 66 unforced errors in his loss to world number 79 Thompson.
The victor will play Italy or Belgium in the semifinals in September.
The host nation, which has won tennis' premier worldwide team event 28 times, now needs just one more win for a berth in the Davis Cup semi-finals.
A home semi-final would lead TA to consider bringing a second tie back to Pat Rafter Arena within the space of five months, with Perth and Sydney alternatives.