BOSTON – The disappointment of their last Olympic marathon trials turned into delight for Deena Kastor, Magdalena Lewy Boulet and Blake Russell.

Kastor won the U.S. Olympic marathon trials Sunday, earning a berth in the Beijing Games by erasing a gap of almost 2 minutes to pass Lewy Boulet in the last 3 miles. It will be the second Olympic marathon and third Olympics for Kastor, who ran the 10,000 meters in Sydney.

“I accomplished two major goals: first, to make the team and, secondly, to win,” said Kastor, who won the bronze medal in Athens despite fading in the U.S. trials and finishing second. “It’s an absolute honor that this is my third Olympic team. It feels just as sweet the third time around.”

This time she’ll be joined on the American marathon team by two runners who just missed out four years ago. Russell finished fourth in the 2004 trials, missing a spot on the Olympic team by 35 seconds, and Lewy Boulet was also on the outside, in fifth.

“After the disaster in 2004, we knew we had to develop a game plan to get where I am now,” Russell said. “My goal was top three, by an inch or a mile. If I was third, that was as good as being first. I just didn’t want to be fourth – again.”

Kastor finished in 2 hours, 29 minutes, 35 seconds to earn a $50,000 prize and the chance for a $10,000 bonus if she lines up in Beijing. Lewy Boulet was 44 seconds back; Russell was 2:21 behind her, but an all-important 1:13 ahead of first alternate Zoila Gomez.

Ryan Hall, Dathan Ritzenhein and Brian Sell earned spots on the men’s team with their top-three finishes in the New York trials in November.

On a perfect morning for a marathon, with a clear sky and temperatures in the high 50s, 146 women set out on a loop course that crossed back and forth over the Charles River before leading them back onto Boylston Street for the traditional Boston finish. The roads and bridges were lined with thousands of fans, many of them runners planning to head to Hopkinton for Monday’s 122th edition of the world’s longest-running long run.

Wearing the favorite’s bib No. 1, Kastor bobbed along in a blue singlet and white cap, taking off her sunglasses before making the final turn. She grabbed an American flag and waved it as she ran toward Copley Square, where no U.S. man has claimed victory in the Boston Marathon since Greg Meyer won in 1983.

Kastor, Lewy Boulet and Russell were all wrapped in American flags, handed U.S. Olympic team jackets and crowned with the olive wreath traditionally given to the Boston Marathon winner. They were invited to serve as honorary grand marshals for Monday’s race.

Joan Benoit Samuelson, who at 50 said this would be her last competitive race, finished in 2:49:08 to set an American record for the 50-54 age group. The two-time Boston winner won the inaugural Olympic women’s marathon – the only U.S. medal in the event until Kastor took the bronze in Athens.

“It’s been a great run,” Samuelson said before turning to Kastor. “I’m handing the torch off to her now, and she can run with it. And I’m sure she will.”

Samuelson crossed the finish line in a Red Sox cap, as she did when she won the Boston Marathon as a Bowdoin College senior in 1979.

“There have been some great years in between, and some not-so-great years,” said Samuelson, who has battled a series of injuries. “For the Red Sox and myself.”

Kastor was an overwhelming favorite for the second consecutive trials, with a personal best that was 12 minutes faster than the next-closest competitor. But by Mile 14, Lewy Boulet led by 1:56 – the entire length of the 2,000-foot Harvard Bridge, the longest of the city’s spans across the Charles.