Follow Alex Labidou on twitter @sportslab and feel free to ask any question about tonight's game.
Game over. Overall good showing by the U.S. but in all honesty, it could have been up by at least four goals.
Dempsey goes down on a trip in the box but it isn't clear whether or not he was fouled or slipped.
There will be two minutes of extra time.
Canada is also concerned about its goal differential as conceding too many goals could come back to haunt them.
When Canada goes back and watches the film, it will realize that it had several chances to walk away with at least a draw. That's what separates winners and losers, taking advantage of opportunities.
Another key moment for Howard as he catches a looping cross in the penalty area.
The fans are singing Timmy Howard out loud showering him with their praise.
Howard has the save of the game as a point blank shot gets blocked by the fingertips of the 32-year-old
Bradley's long ball releases Donovan up top but the 29-year-old slows down. Keeping possession has been priority for the Stars-and-Stripes
Substitution Terry Dunfield Jonathan Beaulieu-Bourgault
The Canadians are building up another patient attack.
Substitution Dwayne De Rosario Rob Friend
Even though the game is almost over, the U.S. is still being aggressive. Don't forget, every goal counts as if the U.S. has a tie with another team, goals could be the advantage.
Substitution Jermaine Jones Maurice Edu
Jermaine Jones had a solid performance today as well and he is getting applause as he walks off the pitch for Maurice Edu
Bradley continues to dominate in the midfield. Calm and steady on the ball, he has been a force in the game.
Substitution Jozy Altidore Sacha Kljestan
The man of the match, Altidore, is coming off for Sacha Kljestan. Bradley wants to ensure the U.S. retains possession.
Questionable call by the referee. Altidore is clearly fouled by the Canadian defense in the box and wasn't awarded the penalty.
McKenna almost scores for Canada off the corner. Canada is knocking on the door.
His play seems to have reinvigorated the Canucks.
Ali Gerba enters the game as a sub and gives Canada another great shot at goal which forces a corner.
The life has been sucked out of the Canadians who had some great chances early in the second half.
Substitution Will Johnson Ali Gerba
Substitution J. Agudelo Chris Wondolowski
Agudelo is coming off for Chris Wondolowski. An decent effort by the 18-year-old who moved without the ball well but missed some good chances.
Almost gets another one!!! Altidore crossed the ball to Juan Agudelo who almost gets his foot on the ball.
Assist J. Agudelo
Goal Clint Dempsey
GOAL!!!!! Dempsey gets a fantastic effort in sliding in to get Altidore's low cross.
Johnson almost levels for Canada as his midrange effort sails past Tim Howard towards the left.
Dempsey almost gets in what would have been the best goal of the Gold Cup, Having a reserve bicycle kick go just wide.
Agudelo couldn't finish a well targeted opportunity as he put a little too much power on the shot.
Canada misses its best opportunity of the match as Hutchinson had his chance blocked by the U.S. defense.
Altidore almost scored off of a header. The U.S. is starting to control the game again. Bradley has been key with his distribution in the center of the field.
Whatever Canada's coach Hart said at halftime must have worked. The Canucks have been brought to life.
Yellow Card Will Johnson
Yellow Card Michael Bradley
The game is getting aggressive and the rivarly is beginning to show both Michael Bradley and William Johnson have received yellow cards.
Canada is stepping it up. As De Jong and De Rosario are creating lethal chances in the U.S. final third.
Even though the U.S. has dominated in the first half, it needs to score again or could risk Canada getting back into the game from a lucky chance.
Canada kicks off to start the second half.
First half ends and the U.S. fans are showing their appreciation of the Stars and Stripes efforts so far.
Refs are indicting one minute of added time.
Good movement by Canada. If it can execute in the box, the Canucks can level this match.
Agudelo almost scores again with a powerful effort that goes into the hands of Hirschfeld.
The crowd sighs collectively as Juan Agudelo almost doubled the lead off of a nice feed from Donovan on the right hand side. Score remains 1-0.
Agudelo begs for a penalty but is denied by the referee. Play on rook
Offsides called on Canada.
A great counter attack sees the U.S. storm up the field.
Canada's men race back to snuff out the U.S. attack.
The U.S. is patiently building its attack again from the back.
Dewayne De Rosairo gives Canada its first real opportunity with a beautiful curling shot that just goes wide.
Canada is really missing De Guzman. His steady tackling and passing would have made a big difference.
Another errant cross by Donovan. He may have assisted on the first goal but so far his crosses are leaving a lot to be desired.
Good movement by Canada. Is it a bit strange that their smaller contingent of fans are louder than the U.S. fan base?
Juan Agudelo misses a close range opportunity in the box as his shot goes into the stands.
Michael Bradley draws a foul in the midfield.
Talk about another close chance goes begging as Donovan's cross just misses Altidore's head who surely would have scored again.
The U.S. had another great opportunity created by its midfield as it gets the ball to Altidore in the box but the 21-year-old striker is swarmed by Canada's defense.
The game's fast pace has slowed considerably since the opening 15 minutes. Canada is trying to become patient on the ball while the U.S. is playing counter, waiting for the Canucks to make a mistake.
The U.S. continues to be really aggressive in this match. It almost scored again as Altidore almost had another chance.
Down a goal, Canada's is beginning to get more aggressive.
Assist Landon Donovan
Goal Jozy Altidore
GOAL!!!!! Jozy Altidore breaks his scoring drought, blasting a goal past Lars Hirschfeld.
Donovan is charging up the field, then passes to create possession. Good positive play by the U.S.
The Canucks are beginning to create momentum from the back. Now if it could get the ball past the midfield line....
This is rare, the U.S. is dominating possession and being aggressive on offense.
Canada's defense has held up well but it has to find a way to keep the ball. Eventually mistakes will be made otherwise.
Lot of action so far. Dempsey's free kick effort misses slightly. The players get another opportunity at goal but is blocked by Canada's defense.
Will the U.S. be able to solve its issues up top. It has averaged half a goal a game over its past few matches.
So far Canada is being aggressive, pushing the ball up the field.
Kick off time! It's kind of weird at Ford Field. The game is on but they are still announcing Canada's lineup.
CONCACAF won't be happy with this stat, only 28,209 fans appeared in Ford Field tonight, which can hold 80,000 fans.
Hello Goal.com readers, this is Alex Labidou providing you with LIVE commentary on tonight's tense rivalry match between the United States and Canada at Detroit's Ford Field. I'm sitting at the stadium and will be sharing with you some insights on the game, fans at the arena and any other tidbit that I find interesting. BTW, if you have any questions or comments, shoot them over @sportslab on twitter.
Surprises? Julian De Guzman is out injured for Canada. Yesterday, I spoke with him and he appeared to be moving well. Maybe there is a niggling injury for the Toronto FC midfielder. As for the U.S., Bob Bradley is taking a major gamble by starting 18-year-old prodigy Juan Agudelo alongside Jozy Altidore. Yes, Agudelo is very talented and shows a lot of promise but it might be a risky move considering this is the first game of the tournament.
Just received lineups for tonight's match: US: Howard, Bocanegra, Goodson, Ream, Cherundolo, Jones, Bradley, Dempsey, Donovan, Altidore and Agudelo Canada: Hirschfeld, Ledgerwood, McKenna, Hainault, Dunfield, Johnson, Simpson, Hutchinson, DeRosario, Jackson, De Jong