The last stage of the season featured Clijsters battling Henin for the top ranking. Clijsters defeated Henin in the final of the Tennis Grand Prix in Filderstadt to defend her title and her world No. 1 ranking. This was the eighth time in WTA history where the top two players in the world faced off for the top ranking. Although Clijsters lost the top ranking to Henin the following week, she regained it a week later by winning the Luxembourg Open for the third year in a row. She finished her season by defending her title at the WTA Tour Championships in the first year where the tournament switched to a round robin format in the initial stage. Clijsters swept her group of Mauresmo, Elena Dementieva, and Chanda Rubin. She won her semifinal against Capriati before defeating Mauresmo again for the title. With the million dollar prize, Clijsters finished the season as the tour prize money leader and became the first player to earn four million dollars in a season on the WTA Tour. Nonetheless, Henin took the year-end No. 1 ranking by improving on her performance at the event from the previous season.