Rafael Nadal, on back of the Toronto win and by reaching the Cincinnati semifinal, is set to replace the current world number one Roger Federer after the Games, while Jelena Jankovic will also attain the No.1 rankings in women's part, calling halt to her compatriot Ana Ivanovic's nine-week dominance over the top.

Jankovic, who crashed out of the quarterfinals of the Montreal Cup after losing to the 19-year-old Dominika Cibulkova last Friday, will become the 18th world number one since 1975.

"Since I was a young girl, it has been my dream to become number one in the world," Jankovic told the WTA website. "When you get older, at least one day you can say you were number one and no one can take that away from you."

The 23-year-old, together with Ivanovic and men's world number three Novak Djokovic, will be the major medal hopefuls for Serbia in the upcoming Games. But they all suffered defeats in the past week.

Since claiming the French Open title in June, Ivanovic just played the Wimbledon and last week's Montreal Open, suffering early exit in both of the tournament.

Djokovic finally snapped the three-match losing streak against Nadal and the Spaniard's 32-match unbeaten streak this season as well in the semifinals of the Cincinnati Masters event, although the 21-year-old lost to Scot Andy Murray in the final.

Murray is seeing his best season and will travel to the upcoming Beijing Games with a renewed conviction in his game with his first career Masters title.

Murray, who rose to a career-best sixth in the world on Monday, will compete in the men's singles and doubles with his brother Jamie in the Olympic Games.

Federer is still suffering the most heartbreaking setback in the past five years, bowing out of the quarterfinals of the Cincinnati event after losing to big-serving Croat Ivo Karlovic.

Federer, who will be celebrating his 27th birthday on the day of the ceremony, will lead his country at the opening of the Beijing Olympics.

"It is a true honor for me to lead the Swiss athletes into the stadium, carrying the Swiss flag," Federer said on his official website.

"I have had the privilege to experience many wonderful things. The Olympics are and will always be one of the best.

Federer came into the Athens Games as a heavy gold medal favorite but suffered an upset against Czech Republic's Tomas Berdych in the second round.

He also participated in the Sydney Games where he met his girlfriend Mirka Vavrinec and claimed the fourth place.

Except the Serbian duo, the Russian women's contingent will also be eyeing the gold medal at the Games.

Russia has just suffered a major setback as the world number four Maria Sharapova has announced withdrawal due to shoulder injury, but they still boast the best women's line-up in the world featuring Svetlana Kuznetsova, Dinara Safina, Elena Dementieva and Vera Zvonareva.

World number seven Dinara Safina has become a heavy favorite for the event as she beat Slovakia's Dominika Cibulkova 6-2, 6-1 to claim the Montreal Cup on Sunday and her second title in a row.

"I think my experience helped me a bit in the final, I'm sure Dominika's time will come soon though," an elated Safina told the WTA official website.

"It's the first time in my life I have won tournaments back-to-back. Usually I would win a tournament and the next week I would lose in the first round.

"So I was happy when I won the first match and then I was just taking it one match at a time."

In a possible Beijing showdown, American brothers Bob and Mike Bryan also hit top gear ahead of the Olympic Games as they came from behind to beat Israel's Jonathan Erlich and Andy Ram in Cincinnati Masters event on Sunday.

The 30-year-old Bryan twins have won titles this season at ATP Masters Series events in Miami and Rome and in Barcelona.

"It's a huge confidence boost and it's our first title in a few months," Mike Bryan told the ATP official website.

"In this tournament I think we played extremely well. We're going into the Olympics playing, I think the match is the best test we have all year.

"To beat a great team like Andy and Jonathan who have had a tremendous year, it bodes well. I mean, a huge goal of ours is to have a good performance at the Olympics. We've been looking forward to it all year. We're going to take a week off and then give it our best shot."

The host China needs to pin their hopes on women's doubles in which they hope the ace duo Zheng Jie and Yan Zi will defend the title they had won in Athens four years ago.

But head coach Jiang Hongwei played down the medal hopes in the August 10th – 17th tennis event.

"Women's doubles changed a lot since and the WTA has raised the ranking points and the prize money for the event, so more and more players get involved and the rivalry has become tight," said Jiang at the Olympic Green Tennis Center on Monday.

The Chinese women's team went to North China's Tianjin for final assault towards the Beijing Games since the players finished the Wimbledon competition.

The three-week-long camp was completely behind-door as the Chinese team needed to get away from the media hype. "When we came back from the Wimbledon, we were just stunned by the noisy media at the airport. The players need to calm down ahead of the Games," Jiang said. "Keep a cool mind helps shrug off the pressure."

"We posed challenge towards other duos four years ago, but now the situation is reversed. Zheng/Yan is under the spotlight while other players are lurking around, so the competition will be a hard-fought one."

Zheng and Yan are looked at as the heaviest favorites of China in tennis event and the host country also need them to fuel the medal drive to charge the top of the medal tables.

Chuang Chia-Jung and Chan Yung-Jan from Chinese Taipei, ranked seventh and eighth separately in the doubles, are the most consistent duo in the top 20 doubles players. The Taipei duet, who kept a 3-0 record over Zheng and Yan in 2007, will be expected to cause trouble for the Chinese contingent.

"It was not only the Chinese Taipei team, many other teams are hard to beat. It's possible for anybody to win the doubles title."

The doubles event has a 32-team field with America's Williams sisters and Lindsay Davenport/Liezel Huber, Russia's Svetlana Kuznetsova/Dinara Safina and Elena Vesnina/Vera Zvonareva, and Spain's Medina Garrigues/Ruano Pascual also eyeing the medals.