2003 - Made pro debut on ITF Circuit (played four events), also Tour debut (l. in Luxembourg qualifying).

2004 - Top 100 finish in first full season on the Tour, making the biggest ranking jump of any player in 2004 (608 spots); as world No.156 qualifier at Zürich (in third career main draw after Vienna, Birmingham earlier in season), upset No.29 Golovin 75 67(2) 76(3) in 1r (overcame 5-1 third-set deficit, 2mp), l. to V.Williams 76(11) 76(6) in 2r (held five set points in first set and three in second set tie-break); the next week, made Tour QF debut at Luxembourg (l. to Medina Garrigues), afterwards on November 1 made Top 100 debut (at No.96); started season winning first 21 matches and three titles, $10,000 ITF/Mallorca 2-ESP, $50,000 ITF/Gifu-JPN (as qualifier) and $50,000 ITF/Fukuoka-JPN (as qualifier); won two more $50,000 ITF Circuit titles (ITF/Fano-ITA, ITF/Batumi-GEO) just prior to qualifying for Zürich.

2005 - Breakthrough season, highlighted by career-first Tour singles title at Canberra and first Top 20 finish; captured title in first event of year at Canberra (as qualifier, d. LL Czink in final, had defeated Czink in final round of qualifying, believed to be a Tour first; 26th qualifier in Tour history to win a title); reached QF or better at five other events, incl. QF at Miami (d. world No.7 Kuznetsova en route for first Top 10 victory, falling to Mauresmo in first Tier I QF), SF at Warsaw (d. No.10 Zvonareva en route to first Tier II SF, losing to eventual champion Henin-Hardenne), QF at Roland Garros (on debut, d. No.3 Mauresmo en route for best match win of career to date, falling to Petrova in first Grand Slam QF), and consecutive SF in the fall at Zürich (l. to Schnyder in first Tier I SF) and Linz (l. again to Schnyder); in addition to Roland Garros, made debuts at all other Grand Slams, at Australian Open (l. in 3r to Mauresmo), Wimbledon (l. in 3r to Pierce) and US Open (as No.18 seed, upset in 2r by Vento-Kabchi in 3s; at No.16, was highest ranked player to make her debut at the US Open since No.14 Capriati in 1990, bettered only by No.12 Seles in 1989 since inception of computer rankings in 1975); reduced ranking to less than one-fifth between beginning and end of season, ranked No.100 in first event at Canberra, making Top 50 debut (at No.50) on March 7, Top 20 debut (at No.20) after Wimbledon, and rising to current career-high No.16 on August 29; withdrew from Toronto [Canadian Open] prior to 3r match vs. Clijsters w/right pectoral muscle strain, withdrew from Luxembourg w/right shoulder injury and from Moscow w/left wrist strain.

2006 - Second consecutive Top 20 finish; season highlighted by capturing second and biggest Tour singles title at Tier I Montréal (as No.13 seed, d. No.9 seed Safina in SF and No.7 seed Hingis in final); clinched US Open Series victory with the title; seven-time quarterfinalist, at Sydney (upset No.2 seed Mauresmo en route, falling to No.6 seed Kuznetsova), Indian Wells (l. to Dementieva in 3s), Warsaw (upset No.2 seed Schnyder en route, falling to Chakvetadze in 3s), ‘s-Hertogenbosch (l. to Dementieva), Los Angeles (l. to Jankovic), Linz (l. to Sharapova) and Hasselt (l. to Krajicek); win over world No.3 Mauresmo at Sydney was equal-biggest career victory, and win over world No.8 Schnyder at Warsaw was second Top 10 win of season, fifth of career; reached 4r twice, at Miami (l. to Mauresmo) and Wimbledon (as No.19 seed, d. No.14 seed Safina in 3r, falling to top seed and eventual champion Mauresmo); 3r three times, incl. Roland Garros (as No.19 seed, l. to No.10 seed Myskina) and US Open (as No.16 seed, l. to WC S.Williams); 2r three times, incl. Australian Open (as No.21 seed, upset by Stosur), and fell 1r three times, incl. Berlin (ret. vs. N.Li w/left hamstring strain); notched 100th career singles match win in Warsaw 1r (vs. Domachowska), also surpassed $1 million in career prize money earnings; on September 11 (after US Open), moved from No.17 to No.15, her career Top 15 debut; on October 16, moved up to No.13, a new career-high; reached first Tour doubles final at ‘s-Hertogenbosch and a semifinals at Tokyo [Pan Pacific] and Warsaw (all w/Kirilenko); withdrew from Rome w/left hamstring strain and from Stuttgart, Zurich w/right shoulder tendonitis.