Here's a short story:

(CNN) -- Ryan Lochte won the United States' first gold medal at the London Olympics with an outstanding performance in Saturday's 400m individual medley. 

Swimming superstar Michael Phelps, who has 14 Olympic gold medals from his three previous Olympics, could only manage fourth place in a disappointing performance. 

"I think I am in shock right now. Going into these Games I knew I was capable of getting the win. I'm happy that I was able to do that," said Lochte. 

The rivalry between Lochte and Phelps has dominated the build up to this year's swimming competition, but Phelps couldn't live up to the hype as he struggled to find the form that helped him win eight golds in eight days at the 2008 Beijing Olympics. 

With First Lady Michelle Obama in attendance, Lochte, the current Fina male swimmer of the year, dominated the race from the start. 

The six-time Olympic medal winner, including three golds, opened up an early lead and never looked liked being caught in the race that combines four different strokes. 

Phelps hasn't missed out on a medal since finishing fifth in the 200m butterfly at the 2000 Sydney Olympics, but he ends day one empty handed after finishing behind surprise medal winners Thiago Pereira and Kosuke Hagino. 

"It was just a crappy race. They swam a better race than me, they swam a smarter race than me and that is why they are on the podium," said Phelps, who is scheduled to compete in seven events at the Games.  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What sport is Phelps in?
Guess: swimming

Question: Who was his teammate?
Guess: Ryan Lochte

Now answer the following question in the same format.

Question: Who do they swim for?

the United States