Nick Kyrgios is top five material: Courier

Australia' s Nick Kyrgios played John Isner in the second match of the series, and dominated, winning in straight sets over the American, now ranked 23 in the world.

"That's what representing Australia is all about", Australian Davis Cup captain Lleyton Hewitt said.

An Italian win would see them play a semi-final in Australia and Hewitt would no doubt consider using Tennis Australia's portable grass court.

United States captain Jim Courier originally nominated Sam Querrey as one of his doubles players but had telegraphed the possibility of a late change, which he made by summoning Sock - the top-ranked player in the tie at No.15 in the world - an hour before play.

Nick Kyrgios overcame a shaky start to down Sam Querrey 7-6 (4) 6-3 6-4 and send Australia into the Davis Cup semi-finals with a 3-1 victory over the United States in Brisbane on Sunday.

Sock replaced Querrey in Saturday's doubles and paired up with Steve Johnson to beat Sam Groth and John Peers 3-6 6-3 6-2 2-6 6-3 to keep the visitors alive at 2-1. If Belgium wins, they will host the semifinal, if Italy comes back to claim victory, they will have to travel Down Under.

Courier added: ´Maybe not the guys in the locker room who have to play against him, but for everyone else involved in the sport, it's a great thing if Nick can find his potential. "I'm only human. I'm not going to change in that department", Kyrgios said. I played well on clay previous year, had a couple of good results.

"I thought (the crowd) really embraced me this time".

"It's fun to have a breather and have something to play for tomorrow", Courier said.

"I've beaten every other singles player, so I feel confident whoever I go up against". "He came up clutch".

He landed a sumptuous cross-court forehand on the line to bring up three break points in the fourth game of the final set but Isner saved them with all.

Kyrgios, so often seen as a lone wolf in world tennis, was swamped by teammates after serving his 20th and 21st aces on the last two points of the match.

The 79th-ranked Thompson won both of his singles in his Davis Cup debut against the Czech Republic in February, but he was more impressive against No. 15 Sock, the highest-ranked player in the quarterfinal.

Thompson was first up on Friday, getting the better of Sock who looked all at sea.

  • Julie Sanders