Nick Kyrgios is top five material: Courier

Nick Kyrgios is top five material: Courier

Nick Kyrgios is top five material: Courier

American captain Jim Courier said on Friday night that the United States team would "rally" around Sock, a former Wimbledon doubles champion, after he had finished with energy tanks near empty in a four-set loss to the lower-ranked Jordan Thompson.

"They've put so much hard work and effort into this campaign".

"But with Lleyton on the side telling me to compete for every point, and obviously the crowd, it's easy to get up out here".

Isner said he ran into an in-form player.

The victor of the tie will remain in Asia/Oceania Group 1, while the loser faces a play-off later in the year to avoid relegation to group 2.

Australia is now one win away from advancing to the semifinals.

Isner battled to the end, saving a match point at 6-5 to take the third set into a tiebreak, then charging into a 5-2 lead.

Belgium led their home tie against Italy 2-1 and if they advance, their semi-final against Australia in September would be in Belgium.

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.

"Honestly, I think the last two months has taken a lot out of me", he said.

Unheralded Jordan Thompson stunned world number 15 Jack Sock in four sets in the opening rubber of the Davis Cup quarter-final between Australia and the U.S. in Brisbane on Friday. Generally over best-of-five on the day the better player will win.

Kyrgios was in no mood to allow Isner into their encounter as he edged the second rubber in straight sets, 7-5, 7-6 (7), 7-6 (7).

Serbia and France won their Davis Cup quarterfinals on Saturday to set up their first match since the 2010 final. "My game is feeling good", Sock said.

The US originally named Sam Querrey and Steve Johnson for Saturday's doubles match against Australians John Peers and Sam Groth, but teams can make changes in the morning under Cup rules.

They will face Belgium in the last four after David Goffin claimed his second point of the tie with Italy to halt any chance of a revival.

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

Australia surged back into contention after a Groth forehand down the line secured the crucial break in the fourth set.

The Italians trailed 2-0 but won the doubles rubber yesterday as Andreas Seppi and Simone Bolelli prevailed in a five-set epic to beat Ruben Bemelmans and Joris De Loore 4-6, 6-3, 6-4, 3-6, 7-6.