Wimbledon - Roger Federer has made Centre Court his second home over the past four years and will be aiming for a fifth consecutive title when he begins his campaign on Monday.

But there are a host of others planning to ruin the world number one's dream, most notably an American, a Spaniard and a Serb.

Eurosport.yahoo.com's Pippa Davis takes a look at those aiming to be victorious on Centre Court in two weeks time.

Roger Federer

Should he win again this year at the All England Club, Federer would become only the second man, after Bjorn Borg, in open era history to win five consecutive titles at Wimbledon. Federer, who only dropped one set last year on his way to victory, has won 48 straight matches on grass and has won 10 of the 12 Grand Slam finals he has played. But Federer, who has held the top spot in the rankings since February 2004, has changed his preparation this year opting not to go to Halle, where he has also won for the past three years, but instead to rest into the lead up to the three major of the year. While Federer will still go into the tournament as the overwhelming favourite, it remains to be seen whether the change in preparation was a good idea for the world number one.

Andy Roddick

By his own omission Roddick had a poor grass court season in 2006, failing in his attempt to win at Queen's for the fourth year running before losing to Andy Murray in the third round of Wimbledon. But since joining forces with Jimmy Connors the energetic American has been enjoying something of a resurgence. Roddick immediately reached the final of the US Open, which he won in 2003, before again losing to Federer and has returned to number three in the world. Roddick has also returned to winning ways on the grass, recovering from match point down to beat France's Nicolas Mahut 4-6 7-6 7-6 at the Artois Championships to equal the record number of title won at the Queen's Club. But being seeded third for Wimbledon means Roddick is likely to run into Federer at the semi final stage and with a losing 13-0 record against the world number one, the American will have his work cut out if he is to reach the final.

Rafael Nadal

Although grass is undeniably the Nadal's weakest surface, the 2006 grass court season proved a revelation for the Spaniard. By making the final of Wimbledon, where he lost in four sets to Federer, Nadal more than doubled the number of matches he had won on the surface in his entire career. But the world number two did not have an easy run through to the final, at point being just two points from victory against qualifier Robert Kendrick. It would be stupid to count Nadal out but he has never been entirely comfortable on the grass which allows players to go into a match aginast him with confidence, as Mahut proved at Queen's, a luxury they do not enjoy on other surfaces – particularly clay.

Novak Djokovic

Djokovic is the rising star of the year leading the Serbian charge on tour having already won three titles, at Adelaide, the Miami Masters, where he beat Rafael Nadal, and Estoril, as well as reaching the final at the Indian Wells Masters. The 20-year-old's best performance on grass so far is his run to the fourth round last year when he was beaten by Mario Ancic in five tough sets. But Djokovic has consistently improved this year raising his ranking from 16 at the beginning of the year to a career high of four after reaching the semi finals at Roland Garros. Currently ranked third in the ATP Race shows Djokovic's consistency over the past six months and signals him out as a danger to anyone.

Lleyton Hewitt

Former champion Hewitt may seem an unlikely choice to resume his grand slam winning ways after more than four years without a major title. But the Australian has been enjoying a resurgence in recent months seemingly regaining his focus after getting married and having a child late in 2005. Hewitt won Las Vegas beating Marat Safin in the semi finals. Although he has only managed to move up one place in the world rankings to 19th since the beginning of the year, Hewitt can never be ignored as a threat when as his battling never-say-die attitude is enough to wear any opponent down if he really wants to.

Others to watch out for ...

Cypriot Marcos Baghdatis and Czech star Tomas Berdych are also potential danger players that could cause an upset. Baghdatis has found it hard to maintain his progress after his breakthrough season in 2006 when he enjoyed a dream run through to the Australian Open final as well as reaching the semi final at Wimbledon. But the 22-year-old has a habit of recovering from seemingly overwhelming deficits and can trouble anyone on his day.

Berdych proved his quality when he became the first player to beat both Roger Federer and Rafael Nadal since they reached their current positions as world numbers one and two. The 21-year-old's best performance at Wimbledon came when he reached the fourth round in 2006, but he has recently took advantage of Federer's absence in Halle to take the Gerry Webber Open title.

Chilean Fernando Gonzalez, who reached Australian Open final early this year, Argentinean Guillermo Canas, who has already beaten Federer twice this year as he continues his return after a doping ban, and American James Blake are also players to keep an eye on as they are highly capable of causing upsets along the way.