O. González enters the game and replaces P. Arriola.
Kessel blazes well wide of the target as a frustrated Steffen barks out instructions.
Berhalter moves to shore up his defence for the final few minutes, introducing centre-back Gonzalez in place of attacker Arriola.
90'
Bradley now unfurls a tame attempt that Room clutches safely to his chest. It's still 1-0 and we're heading into four minutes of added time!
89'
Curacao are leaving gaps at the back in their desperation for an equaliser and that allows Zardes to meet a cross, but he can't crane his neck enough to keep the header down.
87'
Curacao continue to come forward as a stooping Long is forced to head away another cross. Can the outsiders create a clear-cut chance to get back on level terms?
82'
Morris blasts over the bar, giving goalkeeper Room a reprieve after his punch from Pulisic's corner failed to find any distance.
80'
M. Maria enters the game and replaces S. Martina.
Maria gets a turn for the final 10 minutes as Shermaine Martina, who was on a booking, heads for the bench.
77'
Berhalter still has two subs up his sleeve, while Bicentini has one change left to make.
75'
G. van Kessel enters the game and replaces K. Gorré.
Curacao almost find a way past Steffen from a free-kick, but the flag is up.
Gorre has played well, but his time is up. Van Kessel comes on as Curacao chase an equaliser.
72'
Into the final 20 minutes now in Philadelphia and Curacao are having the better of possession. USA seem content to sit on their 1-0 advantage.
Minute
Description
70'
E. Hooi gets yellow.
Hooi holds back Pulisic and joins Shermaine Martina in referee Adonai Escobedo Gonzalez's notebook.
69'
Carolina plays a ball into the box with his first involvement of the match, but Zimmerman is there to clear. USA are still lacking direction and energy all over the pitch.
68'
J. Carolina enters the game and replaces A. Statie.
Not good news for Statie as he goes off on a stretcher after seemingly pulling his hamstring. Carolina comes on at left-back.
63'
J. Morris enters the game and replaces T. Boyd.
Berhalter does turn to the bench for inspiration as the ineffective Boyd makes way for Morris.
62'
Berhalter must be considering a change. USA have been completely ponderous in possession. Zardes in particular has made almost no impression on the match.
Nepomuceno fires straight at Steffen off his left foot. Boyd now wins a free-kick to relieve some of the mounting tension.
60'
We've almost reached the hour mark and there's still only one goal separating the teams. Curacao can be extremely proud of how well they're competing.
57'
Pulisic almost sparks his team into action! The attacker turns and shoots low, hard and wide of the target. He's unhappy not to have won a corner.
54'
Nepomuceno looks to bend one inside the bottom-left corner. Steffen had the post covered.
51'
Ream's lazy pass almost exposes USA's defence. This has been a lacklustre start to the second half from the reigning Gold Cup champions, who have been sluggish in possession.
49'
Right-back Gaari makes a timely interception after Boyd found a promising pocket of space around the edge of the area.
47'
Boyd runs a long way down the right flank, only to float a poor cross out of play at the end of it all.
46'
Back underway in Philadelphia as USA lead Curacao 1-0 in this Gold Cup quarter-final!
45' +1
HALF-TIME: USA 1-0 CURACAO
45'
Oh, that could have been a great chance for Gorre! The winger races onto a defence-splitting pass and should shoot, but he hesitates and Ream makes a crucial interception.
44'
A nervy moment for Steffen! The goalkeeper's heavy touch almost invites trouble, but he stretches to hack clear.
42'
With their fourth corner, Curacao finally threaten. Lachman rises and should do better with a header that balloons over.
40'
McKennie makes good progress down the right and links up with Boyd, whose cross is headed up into the air by Cuco Martina. Curacao eventually get it clear.
39'
The wave goes up around Lincoln Financial Field as half-time approaches. USA continue to lead 1-0.
38'
Positive play from Gorre as he cuts inside from the left and unleashes a shot which curls over Steffen's crossbar.
36'
Chance! Arriola and Pulisic combine to tee up Bradley with a shooting opportunity, but the experienced midfielder drags his left-footed effort the wrong side of the right post.
35'
Steffen advances off his line and confidently claims a cross, then plays his part in building from the back with a calm pass under pressure.
34'
The challenge now for Curacao is to reach the break without further damage. They certainly haven't been overwhelmed in this contest.
32'
Nepomuceno can't beat the first man with Curacao's second corner. Their set-pieces have been a source of frustration.
30'
S. Martina gets yellow.
McKennie's goal is his second as a senior international. Not a bad way to celebrate a new contract at Schalke!
Shermaine Martina barges over Pulisic and receives the first booking of the match. The midfielder will now be suspended for the semi-final if Curacao overturn this deficit.
28'
Zardes strays offside to curtail a promising USA move. Pockets of space are beginning to appear in and around the Curacao defence.
25'
W. McKennie has scored a goal for United States! Assist by C. Pulišić.
That's Pulisic's third assist of the Gold Cup, and it was classy. The winger weighted his delivery to perfection.
GOALLL!!! McKennie nods USA into the lead but it's all about Pulisic. The captain isolated his marker on the left, cut back onto his right foot and lofted an inviting cross into the middle for midfielder McKennie to head home. It's 1-0!
24'
Cuco Martina looks to be playing with serious confidence. He just sprinted forward in a bid to join up with an attack after bringing the ball into midfield.
22'
Bacuna wins possession from Boyd, then gives it straight back to USA. Curacao have moved their defensive line higher up the pitch and will need to guard against dangerous turnovers.
20'
Centre-back Zimmerman attempts to drop another audacious cross in behind the Curacao defence. This one runs beyond Arriola.
18'
Good from Zimmerman. His ball over the top reaches Arriola, but the winger can only hook it into the path of a watchful Room.
13'
Curacao opt to go short with their first corner and it breaks down almost immediately. Hooi eventually gets a shot away that isn't troubling Steffen.
12'
Bradley puts far too much on an intended pass for Lima and Curacao are able to take a breather. They're already sagging relatively deep.
10'
Statie dives in on Lima and gives away a free-kick in a dangerous area. Pulisic's delvery drifts over everybody and runs out for a throw-in.
9'
The hosts are dominating possession in these first 10 minutes, with Bradley getting plenty of touches.
6'
Pulisic is looking dangerous already, although he will be disappointed not to have turned home that last chance. Room did extremely well to tip it over the crossbar.
1'
Kick-off! USA get the game started against Curacao in this Gold Cup quarter-final in Philadelphia.
Pulisic shoots wide! It's an end-to-end start as Curacao make an early incursion into the box, before USA break away. Pulisic drives at the heart of defence but arrows his effort past the left post.
Hello and welcome to our live coverage of this Gold Cup quarter-final between the United States and Curacao!
An expectant crowd in Philadelphia will want to see goals with the host nation tipped to enjoy a comfortable route into the final four. USA scored 11 times on the way to topping Group D as victories over Guyana, Trinidad and Tobago, and Panama gave them a perfect haul of nine points. Still, performances have not been entirely convincing and a show of strength here feels necessary.
Curacao, meanwhile, have done well simply to make it this far. Jurien Gaari's late goal in a 1-1 draw against Jamaica sent Remko Bicentini's men through to the knockout rounds for the first time in their history. Defeating an experienced Honduras in the previous match highlighted Curacao as a team on the rise, with a second Gold Cup appearance already a success.
USA XI (4-3-3): Zack Steffen; Nick Lima, Walker Zimmerman, Aaron Long, Tim Ream; Weston McKennie, Michael Bradley, Christian Pulisic; Paul Arriola, Gyasi Zardes, Tyler Boyd.
USA substitutes: Sean Johnson, Tyler Miller, Omar Gonzalez, Reggie Cannon, Daniel Lovitz, Matt Miazga, Will Trapp, Cristian Roldan, Djordje Mihailovic, Jordan Morris, Jozy Altidore, Jonathan Lewis.
Curacao substitutes: Zeus de la Paz, Jairzinho Pieter, Shermar Martina, Michael Maria, Jurich Carolina, Jarchinio Antonia, Shanon Carmelia, Gino van Kessel, Gersinio Constansia, Jimbertson Vapor.
The winner of this match will advance to face Jamaica, who earlier edged Panama 1-0. Haiti and Mexico are set to square off in the other semi-final.
The players are out on the pitch and the anthems are underway!
Curacao should take a lot of heart from that half. While chances have been rare, their attacking play has been creditable and the underdogs look reasonably sound at the back. More of the same should make for a fascinating second 45 minutes.
Better will be expected of Berhalter's charges in their next match, a semi-final against Jamaica in Nashville on Wednesday. The winner of that match will advance to face either Haiti or Mexico in the final.
That wraps up our coverage of a tight and tense encounter at the Gold Cup! We hope you will join us again soon. Until then, it's goodbye for now.
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