Nick Kyrgios secured Australia's Davis Cup quarter-final victory over the United States by beating Sam Querrey.
Kyrgios's win gave the 28-times champion an unassailable 3-1 lead over US before John Isner won the dead rubber 7-6 (5), 6-3 over Sam Groth.
If Belgium wins their quarter final against Italy, they will host the semifinal, if Italy comes back to claim victory, they will travel to Australia.
The victor moves on to play the victor between Italy and Belgium.
Sock was penetrative as any player on court in the fifth set after he was drafted into the doubles with Steve Johnson and reduced Australia's lead in the tie to 2-1 at Pat Rafter Arena.
Following Thursday's draw, American No. 1 Jack Sock will play Australia's Jordan Thompson to open their World Group quarterfinal in Brisbane on Friday, followed by Nick Kyrgios' match against John Isner.
The U.S. has won the title a leading 32 times, with Australia second on 28.
A late break point allowed him to win the opening set, and the following two sets would go into tiebreakers, where Kyrgios was just a hair better than Isner, winning both breakers by a score of 7-5. "I don't get too nervous or wound up too badly, but there is a little extra pressure". It's one thing to say I've been preparing for it but to actually deliver, it feels pretty good.
USA captain Jim Courier replaced scheduled doubles player Sam Querrey with Sock about an hour ahead of Saturday's match, despite Sock having lost his singles match to Jordan Thompson on Friday.
"I always had one eye on it".
Querrey was supposed to be Johnson's doubles partner, but American captain Jim Courier, who said it would take "monstrous effort" for the Americans to win the tie, pulled a swap, putting Sock into doubles and allowing Querrey to be fresh for Kyrgios. Lets hopefully close it out tomorrow, world number 16 Kyrgios said on court after the win.
"They are likely to pick red clay at Roland Garros or Monte Carlo for the clash and I will do my best to make myself available for the semis because we all value playing for our country", Djokovic said.
"When you see players that have so much skill and charisma start to put it together, it's exciting for everyone involved in tennis".
It looked like Sock was still deflated by Friday's defeat when Australia raced to a 4-1 lead in the first set and Peers slammed down an ace to seal it in 27 minutes.