Meanwhile, Munich Open winner Mikhail Youzhny made an early exit to Latvian Ernest Gulbis 7-6 6-4 and 15th seed Stanislas Wawrinka set up a third-round showdown with world number one and Swiss compatriot Roger Federer after beating Leonardo Mayer, who was down 6-4 4-2 when he retired.
Spadea's fellow American, eighth-seed Mardy Fish dropped a set against Lee Hyung-taik of South Korea before winning 6-4 3-6 6-1.
Second-seeded Jelena Jankovic and sixth seed Ana Ivanovic set up an all-Serb clash.
Third seed Robin Soderling beat Nicolas Almagro 7-5 4-6 6-3 to set up a clash with eighth seed David Ferrer, who beat Lu Yen-hsun 6-3 3-6 6-1.
Kim Clijsters produced a magificent third-set comeback to pip fifth seed Amelie Mauresmo 3-6 6-3 7-5 and gain a place in the Porsche Tennis Grand Prix final.
Eighth seed Soderling blew a two-set lead as he crashed out, losing 5-7 2-6 6-4 6-4 6-2 to young Spaniard Marcel Granollers.
Eighth seed Lopez edged the first-set tie-break before making the vital break in the ninth game of the second and served out for the match.
Dokic, chasing her third title of the year, raced out to a 3-0 lead against seventh seed Tanasugarn before eventually taking the opening set 6-3.
Fifth seed Ivanovic squandered a 4-0 lead in the third set, as 10th seed Radwanska reeled off six games in a row to reach the quarterfinals with a 6-1 3-6 6-4 victory.
The top seed - still yet to drop a set in the tournament - will face Marat Safin or Feliciano Lopez in Friday's semi-final, and neither will hold much fear after a supreme display against Ancic.
Kucova will struggle to beat Monfils for local press coverage though after the wild card knocked out fifth seed Tomas Berdych in a five-set thriller, winning 7-6 (10-8) 6-4 6-7 (3-7) 6-7 (4-7) 7-5 to delight a partisan crowd.
The 21st seed was upset 6-3 7-5 despite battling back from 3-0 down in the second set, with Vinci earning a third-round clash with Belgian 13th seed Yanina Wickmayer.
Third-seed Venus had looked a nailed-on winner until the second-set tiebreak, at which point her serve inexplicably deserted her.
Spanish 26th seed Anabel Medina Garrigues went through 6-3 6-3 against Czech Eva Birnerova, while Slovakian 20th seed Daniela Hantuchova recovering from dropping the opening set to Uzbekistan-born American Varvara Lepchenko to win 4-6 6-3 6-2.
Tenth seed Richard Gasquet set up a last-16 clash with world No. 6 Tomas Berdych, while fellow Frenchman Gilles Simon will take on big-serving South African Kevin Anderson.
The home crowd were left disappointed when eighth seed Janko Tipsarevic recorded a battling three-set win over former world No. 1 and two-time grand slam champion Lleyton Hewitt .
There was a shock on Court 13, where 31st seed Michaella Krajicek, who thrashed Britain's Katie O'Brien in the previous round, beat eighth seed Anna Chakvetadze in a marathon three-set battle.
The third seed made light work of Japan's Ayumi Morita 6-1 6-3 to set up a fourth round tie against 14th seed Maria Kirilenko from Russia who was also a straight sets winner (7-6 6-3) over Belgium's Yanina Wickmayer.
Mauresmo failed to win any of four game points at 5-5, as Clijsters, who came from a set behind to been second seed Lindsay Davenport in the quarter-finals, again broke.
World No. 46 Andreas Seppi beat his fellow Italian, qualifier Stephane Bohli, 6-1 7-5 to set up a second-round clash with either Serbian eighth seed Viktor Troicki or Austria's Jurgen Melzer.
The 27-year-old beat former champion and seven seed Jankovic despite letting slip a 5-2 lead in the first set, Martinez Sanchez eventually fighting back to win via a tie-break.
The big-serving Croatian beat ninth seed Richard Krajicek in a marathon match, eventually taking the final set 15-13.
Australian eighth seed Samantha Stosur defeated France's Julie Coin 6-1 7-6 (7-4) to set up a clash with Russian 25th seed Anastasia Pavlyuchenkova.
In the women's section, Serena Williams thrashed Caroline Garcia 6-1 6-2 to set up a last-16 clash with Romania's 26th seed Sorana Cristea.
Slovak number seven seed Daniela Hantuchova was defeated in a three-set marathon with Spaniard Arantxa Parra Santonja 6-4 6-7(7-3) 7-6 (7-5).
The Frenchman, now ranked 57th after last year serving a ban for testing positive for cocaine which was reduced on appeal due to mitigating circumstances, was defeated in a five-set epic by Russian 20th seed Mikhail Youzhny.
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Henin, playing her first tournament since retiring from the sport in May 2008, looked on track for an easy victory after breezing through the opening set 6-2 against seventh seed Melinda Czink.
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