Clint Dempsey, Michael Bradley, Tim Howard, Darlington Nagbe, and Altidore all played on Wednesday after being called in as reinforcements, and they will likely see the field again in this do-or-die tilt. The USA has an impeccable all-time score of 16-1-5 against El Salvador. The teams have tied 10 times as well.
It is not as challenging as the Copa America was, but it's also an event the U.S. has a legitimate shot to win.
Details on how to catch Saturday's match are below.
Arena has been impressed with the Ticos' ability to succeed in the Gold Cup despite suffering key injuries to players like Joel Campbell, Christian Gamboa, Bryan Oviedo and Johan Venegas.
Costa Rica is coming off a 1-0 win over Panama thanks to an own goal in the 77th minute.
The United States may have been able to get away with a lacklustre performance against El Salvador, but they'll have a tougher time against Los Ticos.
You could blame the individual teams and coaches, or the close proximity of the 2018 World Cup, or mere coincidence.
Costa Rica's recent ascendance to CONCACAF contender and international success followed many years as the best team in Central America.
Herculez Gomez sits down with goalkeeper Jesse Gonzalez to discuss his decision to play for the USMNT instead of Mexico.
Before the own goal, Panama had the better of the chances, forcing saves from Costa Rican keeper Patrick Pemberton. The response, in a word, is heartening. "It doesn't prepare us for big games".
But Ruiz will still be there, and so will the history of drama and tension between the two nations.
La Sele and the United States will play on Saturday at 5 p.m.at the ATT Stadium in Arlington, Texas, for a spot in the final. Canada is finally a threat. You'll need to enter your credit card information when signing up, but if you cancel your subscription before the 7-day trial period ends, you will not be charged.
Larin is back for the Canadians.
If Saturday's match is tied after 90 minutes, there will not be 30 minutes of extra time.
Juan Carlos Osorio made no changes for Mexico after the group stage. It's a tournament. Results matter, even if they matter less.
Most notably, a Bruce Arena-led U.S. side defeated Los Ticos 2-0 in the 2002 Gold Cup Final, which also served as Costa Rica's only appearance in the tournament's championship match. "Dry" managed to beat Honduras (0: 1) and French Guiana (3: 0).
Former MLS players Bobby Warshaw and Heath Pearce will be joined by MLSsoccer.com's David Gass and Arielle Castillo in studio to provide in-depth analysis. If not during play, then during penalties.
They won't get a chance to face those teams in the Gold Cup knockout stages.
"It feels good", Waston said following the Wednesday win.