The Masters Cup brings to an end the 2004 season on the men's tour with the eight leading players set to didive a total prize fund of US$3.7m.
The eight players line up ahead of play in Houston
The top seven in the Champions Race qualified, along with the highest ranked Grand Slam champion outside the top seven but inside the top 20 - in this case Gaston Gaudio.
Competition for the final place was a scramble but injuries to former champion Andre Agassi and David Nalbandian ahead of the final qualifying tournament saw Tim Henman secure a spot in Houston.
1. ROGER FEDERER - 1117 points
Federer booked his berth at the beginning of August - the earliest anyone has qualified for the event in its 14-year history.
As well as three Grand Slam titles, the defending Masters Cup champion has also collected three Masters Series crowns and has already ensured he will finish top of the Champions Race - which rates players according to their form over the season.
2. ANDY RODDICK - 656 points
Roddick was the second man to qualify for the Houston event thanks to his four title wins, including the Miami Masters.
The American may not have won a Grand Slam this year, but he has reached a final and two quarter-finals as well as racking up 70 match wins.
3. LLEYTON HEWITT - 613 points
Having won it in 2002 and 2003, Hewitt failed even to qualify a year ago after a disappointing season.
The Australian has bounced back in 2004, winning four titles and reaching the final at the US Open and the quarter-finals of the French Open and Wimbledon.
4. CARLOS MOYA - 484 points
Moya was yet assured of his ticket to Houston after the Paris Masters draw put Andre Agassi and David Nalbandian in the same half.
The Rome Masters champion triumphed in two other tournaments in the first half of the year but since then his form has dropped and the shoulder injury that prevented him competing at the Madrid Masters also forced him out of Paris.
5. GUILLERMO CORIA - 480 points
Dirt lover Coria had a stellar clay-cout season, ruined only by his defeat in the French Open final to fellow Argentine Gaston Gaudio.
But since that defeat, a shoulder injury has restricted him to only four tournaments. Having undergone surgery on the problem, he did not return to action in time to qualify for Houston but other results have gone his way.
6. MARAT SAFIN - 472 points
Victory at the Madrid Masters put the enigmatic Russian right back in the hunt for a place in Houston and his place was confirmed at the Paris Masters.
Safin has had an inconsistent year, beginning the year by reaching the final of the Australian Open but failing to get beyond the first round at Wimbledon and the US Open.
7. TIM HENMAN - 458 points
An injury-hit season prevented Henman qualifying for the Cup in 2003 but he is safely there this time around.
Two Grand Slam semi-finals and a final appearance in Indian Wells put Henman on the verge of qualification, but early defeats at the Madrid Masters and Swiss Indoors dented his hopes.
Qualification remained in his own hands but injuries to his two rivals Andre Agassi and David Nalbandian confirmed the Briton's place in Houston.
8. GASTON GAUDIO - 383 points
Gaudio is heading to the Masters Cup for the first time in his career thanks to his shock French Open win earlier this year.
The 24-year-old Argentine has dropped out of the top seven in the Champions Race but still qualifies by taking the wild card given to the highest-ranked Grand Slam winner inside the top 20.