ARLINGTON — Cowboys Stadium was filled 81,410 strong Wednesday, mostly green and red clad Mexico national soccer team fans for the CONCACAF Gold Cup semifinal between Mexico and Panama.Little did those 81,410 know that Wednesday was really Panamas party and not Mexicos.Panama shocked the 2013 Gold Cup by beating Mexico twice, the latest Wednesdays 2-1 semifinal victory, to advance to Sundays final against the United States. It was only Panamas second victory against Mexico in 14 matches.No, I dont think [we ruined the party], because the party is ours now, Panama coach Julio Dely Valdez said. I dont think weve ruined it for anyone else. We were here to win the game and to get to the final and I dont know if Ive ruined the party for anyone.Panamas party was a homecoming affair, as FC Dallas forward Blas Perez netted the first goal of the game for his native Panama in the 13th minute from a severe angle on the right side of the goal.For me, its an honor for me to score a goal here in Dallas, because I know there was people here from FC Dallas who were here to support us, so it was an honor to score here in Dallas, Perez said.Mexico quickly rained on Panamas parade, while simultaneously igniting their fan base in the stands, by scoring in the 26th minute on a header by Luis Montes that was set up by a Marco Fabian cross.Ultimately, it was a corner kick in the 61st minute that would really start a celebration that continued well after the clock had run out. Panamas Roman Torres connected on a header off a corner kick for his first ever Gold Cup goal. After the game, Panamas players and coaches celebrated with a surprise guest of honor and arguably the most famous Panamanian athlete, Mariano Rivera, who crossed a few parking lots to catch the end of the game after the Yankees played the Texas Rangers at Rangers Ballpark in Arlington.That was spectacular, Rivera said. Im grateful to the Lord to allow us to play the way we played and come out on top. Im humbled to see my team play the way they did and win.The 2013 Gold Cup final will be a rematch of the 2005 final, Panamas only prior appearance in the championship game. After a scoreless regulation, the United States took the game and the tournament, 3-1 in penalty kicks.This years edition, 3 p.m. Sunday at Chicagos Soldier Field, features the team with the most offensive production, the USA, against the team with the fewest goals against, Panama. No team has scored more than one goal against Panama in its last eight Gold Cup games.Were going to go up against a rival who is a great squad, Dely Valdez said. I think we have a great possibility of raising the cup for the first time. I think were going to face the best team at this moment. Theyre the team thats scored the most goals and theyre going to face the team that has the fewest goals scored against, so its going to be a great match.