As activists and conventioneers from around the country converged at Madison Square Garden, another excited – though more reserved – group of out-of-towners assembled in Flushing. The only rally they were interested in was a quiet one between players on a court at the USTA National Tennis Center, where the U.S. Open tournament starts today.

Hundreds of tourists trickled onto the grounds in Flushing to watch players practice free of charge – a tradition for tennis enthusiasts and a reminder that the convention isn’t the only big show in town.

While the Brazilian champion Gustavo Kuerten warmed up with his coach in the Louis Armstrong stadium, Steven Echsner of Gulf Breeze, Fla., said he and his wife came to the Open despite some concerns about security and inconvenience. But, sounding like a seasoned New Yorker, Mr. Echsner said they weren’t about to change their schedules just because of possible dangers – or even 500,000 delegates, guests, and protesters, who would be amassing not far from their (heavily protected) Rockefeller Center hotel.

“The president’s security might be jeopardized but we don’t feel any more or less of a threat than we did when we were here last year or the year before,” he said. “If you analyze it too much you get this analysis paralysis. It’s the 21stcentury challenge: You have to be aware of these problems but you can’t alter your life.”

“If something had happened we probably wouldn’t have come,” his wife, Rebecca added from her courtside seat. But we wanted to be here, at least for the qualifiers.”

She said that coming the day before the tournament “gives you more of an opportunity to see everybody; if you go later in the week, during the semifinals and finals, you miss people, plus the crowds get worse.”

Overcrowding, considering the amount of people in town, was a concern on the minds of others in Flushing yesterday. Charles Waters, who drove from Philadelphia with friends, said he was thankful that Manhattan was not on their route to the tournament. They drove through Staten Island.

“It’s scary. Having the U.S. Open, the Republican convention, the protestors all at the same time, it’s too many people in one area,” he said. “If we had had to come through Manhattan, we might not have come.”

But Mr. Waters was focused more on tennis than terrorism. He agreed that the free practice-watching was one of the city’s best bargains. “Problem is you have to ask people to find out who’s practicing. If they had their names up, it would be more fun.”

Among those spotted hitting balls yesterday were Mary Pierce, Gustavo Kuerten, and the Bryan brothers, who played a small rock concert before conducting a tennis clinic.

Terry Marquardt, a guest of delegates at the convention, came to Flushing for a Mets game and decided to stop by the Open. He and his boss, Michigan state Senator Judd Gilbert, happened upon a practice match between Jennifer Capriati and Wimbleon winner Maria Sharapova. “It was kinda neat. We walked in and they were hitting back and forth,” he said.

What will they be doing for the rest of the week?

“We’ll be going to a lot of the receptions and the convention sessions.” He added with a satisfied chuckle, “I think we’re going to a Yankees game later in the week.”