Roger Federer lost realistic chances to finish the season as the year-end no. 1 in 2003 following early losses in Basel and Paris. The Swiss headed to the Masters Cup in Houston, eager to improve his form and fight for notable points and title.Federer battled against the rivals he had never beaten before in the opening two matches, and he accepted that challenge in style. In the first clash, Roger ousted the veteran Andre Agassi 6-7, 6-3, 7-6 after fending off two match points in the deciding set.Facing another riv …