"I will always compete for Mexico," said Lanaro, whose mother was born there. "I will never compete for any other country."
He is hardly alone in choosing to compete for the land of his heritage over the place of his birth -- a growing practice in recent years as the Mexican American population has surged past 28 million, swelling the eligible talent pool that Mexican sports officials have tapped occasionally.
Five of the nine boxers on Mexico's national team are from the U.S., as are a wrestler, a women's basketball player and two members of last summer's Pan American Games water polo team.
"My whole family's proud. What's wrong with being proud about competing for Mexico?" said Lanaro, who has cleared 19 feet this year and is Mexico's best hope for a track and field medal in Beijing. "I don't see anything wrong with it."
Others are critical, however, with those in the U.S. arguing that American athletes who compete for Mexico are turning their back on the country that trained them in exchange for an easier path to the Olympics. And in Mexico, some coaches and athletes have grown tired of "foreigners" taking opportunities away from locals.
"In my opinion, yes, it's controversial, a little unethical," said German Silva, a two-time Olympian and now a top Mexican distance-running coach.
But it is legal. In fact, top athletes crossing borders to enhance their Olympic prospects are part of a well-established pattern that involves many nations and events. Four years ago at Athens, Americans of Greek descent took the field for the host nation's baseball team, a Chinese-born table tennis player competed for the United States and a Jamaican woman sprinted for Slovenia.
"Freedom of choice is one of the values our country stands for," said Darryl Seibel, chief communications officer of the U.S. Olympic Committee. "And we're not going to stand in the way of someone who wants to compete for another country."
The U.S. has also benefited from foreign-born athletes changing allegiances: 1,500-meter runner Bernard Lagat and marathoner Khalid Khannouchi were born in Africa, yet now hold U.S. records. And national gymnastics champions Nastia Liukin and Alexander Artemev are from the former Soviet Union.
The U.S. rules are stricter than most, though, requiring that Olympians hold American citizenship. Mexico, reflecting the practice of many nations, welcomes athletes who may have been born or reared elsewhere but are of Mexican descent.
That has opened the door for Lanaro and fellow vaulter Robison Pratt, who was born in Saudi Arabia to a family with ties to Mexico dating to before the Mexican Revolution.
Although Pratt's first language is English, he has a degree from Brigham Young University, he lives in Chino Hills and distant cousin Mitt Romney campaigned for the Republican presidential nomination, Pratt wore a Mexican uniform at the 2000 Sydney Games.
"I could have gone either direction," said Pratt, who will miss the Beijing Games because of a knee injury. "I'm comfortable with both cultures. I'm comfortable with both languages. I'm comfortable with a Mexican uniform on."
The government ministry that oversees international sports in Mexico has tried to straddle the controversy, alternately reaching out to Mexican American athletes, then bowing to internal pressure by going mum on the subject while allowing individual sports federations to do their own recruiting.
"There still is some resistance by some of the authorities to Mexican Americans," said Elbert Pratt, Robison's father and a track coach at Monterrey Tech, one of Mexico's leading universities. "But my position is, if they're Mexican citizens or their parents were Mexican citizens, they have a constitutional right. They have the same right as anybody."
In an example of this friction, Pratt recruited DePaul University shot putter Frank Guzman in 2003 to try out for Mexico's Pan American Games team. To qualify, Guzman had to compete in a meet in Mexico. But three athletes must take part in a competition to make it legal, and a Mexican shot putter whose spot on the team was threatened by Guzman organized a boycott of the meet to deny the American a chance.
Pratt eventually rounded up two local teenagers and, after a delay of more than an hour, Guzman threw, breaking the Mexican record by 9 feet.
"The guy's point was, 'I've been working for years, and now this guy shows up and just wins it,' " Pratt said about the athlete who organized the boycott. "Hey, Guzman had been working for years too. This isn't about who has the most right to go because of the number of years they've worked. This is about who is the very best."