They were the afterthought of Group D, a team no one expected to gain even a measly point.
The Ticos did not care.
Costa Rica stunned 2010 World Cup semifinalists Uruguay, 3-1, on Saturday, fighting back from a one-goal deficit to move atop Group D. Joel Campbell's volley in the 54th minute started the comeback, and Oscar Duarte's fearless header provided a lead just three minutes later. Marco Urena's finish cemented the result in the 84th.
"It wasn't a surprise for us," Campbell told FIFA.com. "We came here to win. We wanted the points and we went for them. Despite the fact that they were winning 1-0 we stayed positive. We knew that we were going to win. We never thought about losing and thank God we got the result."
Campbell, who signed with Arsenal as a teenager in 2011 but is yet to play for the Gunners, was a menace all night for the Ticos, who outclassed Uruguay throughout the match.
The result shakes up a group that also includes England and Italy -- two traditional European powers.
In other games on Saturday...
* Colombia showed its attacking prowess early in the day, solving Greece's defensive mindset in a 3-0 victory. Pablo Armero, Teofilo Gutierrez and James Rodriguez all scored to set Colombia off towards the elimination rounds. Highlights from the match.
* Didier Drogba entered a substitute and immediately injected energy as the Ivory Coast scored twice in two minutes to come from behind and down Japan, 2-1. The goals were provided by two other stars, Wilfried Bony and Gervinho, in the 64th and 66th minutes to lift Ivory Coast to the win. Highlights from the match.
* Italy looked the more experienced and better side throughout in a 2-1 win over England. Claudio Marchisio gave Italy the lead in the 35th minute, but Daniel Sturridge equalized just two minutes later. Step in Super Mario. Mario Balotelli's header provided the winner in the 50th minute for the Italians, but the star of the match was Andrea Pirlo, who completed 103 of 108 passes and nearly scored on a brilliant free kick late in the match. Highlights from the match.Check out this free kick, though:
What's on tap today...
12 p.m. ABC - Switzerland vs. Ecuador - The Swiss may be one of the more undervalued teams in this tournament, as they boast several young talented players and went through their European qualifying group unbeaten, conceding just six goals in 10 games. Ecuador is no slouch, however, having finished fourth in CONMEBOL and featuring Antonio Valencia.
Keep an eye on: Switzerland's Xherdan Shaqiri, a young player with plenty of flair who plays at Germany's Bayern Munich. Shaqiri often plays as an inverted winger and will be a handful for Ecuador's defense.
3 p.m. ABC - France vs. Honduras - The Catrachos will try to provide yet another CONCACAF upset, but they face a tough task against a French team that may be overlooked in this tournament. An overhauled roster with several talented young players, France is the favorite in this group.
Keep an eye on: Honduras midfielder Andy Najar. A Honduran immigrant discovered playing pick-up soccer in front of his high school in Alexandria, Va., Najar would go on to star at the high school level, then get signed as a Homegrown player by D.C. United. Now he plays in Belgium and is set to debut in the World Cup. Pretty neat story of the American dream.
6 p.m. ESPN - Argentina vs. Bosnia and Herzegovina - This is the tournament for Lionel Messi to overcome the shadow of Diego Maradona. The Argentines are the favorite in this group, but they open with a tough task against Bosnia and Herzegovina. This will be a very technical squad that features several players from top European club sides.
Keep an eye on: Bosnia and Herzegovina's Edin Dzeko, who has scored 44 goals over the past three seasons for Manchester City in the English Premier League.