The three-set 6-4 3-6 6-3 victory also assures Serena of keeping the world number one spot ahead of Russian Dinara Safina.
Ferreira took the first-set tie-break 7-5 before Philippoussis took the second set 6-4 to send the match into a decider.
When she came back, she won three of the next four games to level the set at 4-4, but Azarenka broke back and then held her serve to level the match.
The 6-foot-9-inch Dalhausser intimidated the Brazilians with three in-your-face blocks in a row to end the final set 15-4.
Murray, who missed Madrid through injury, breezed through opener 6-1 but Nalbandian hit back to level by taking the second set 6-4.
The 19-year-old broke twice to Henman's once to claim the first set 6-4.
Having taken the first set to a tie-break, Soderling fought back from 4-2 down in the second set to level at 4-4 but Nadal -- who lost to Andy Murray in the final last year -- showed no signs of the inconsistency that plagued the latter half of his 2009 campaign as he clinched victory.
If the assets put in a GRAT appreciate faster than a set rate--4% a year for GRATs set up in December 2002--you pass on assets gift-tax free.
The Brazilian won the first eight points of his semi on his way to taking the first set 6-4.
Sharapova lost the first set 6-4 but then dropped only three games in taking the next two sets to earn a last eight match with Urszula Radwanska.
He took the opening set 6-4 in 51 minutes and was a break up in the second before the former No.1 hit back by taking the next three games.
But Safin has also been nowhere near the player who blew everyone away in the Paris Masters a couple of weeks ago, and Hewitt took the first set 6-4.
However, Del Potro broke back when Federer was serving for the second set at 5-4 up, with the set eventually going to a tie-break.
Serving for a two-set lead at 5-4, Falla faltered for the first time, but Federer was unable to take advantage, two break points slipping by before the Colombian forced his opponent off court and put away an easy volley on his fourth set point.
Henin, playing her first tournament since May 2008, fought back from a set and 4-1 down against her fellow Belgian before losing 6-3 4-6 7-6 (8-6) in almost two and a half hours.
Seventh seed Jo-Wilfried Tsonga also advanced, beating Germany's Rainer Schuettler 4-6, 6-3, 6-4 to set up an all-French quarter-final against Gilles Simon.
She was down 4-3 in the first set before putting a run of three straight games together to take a one set lead and 4-1 in the second.
Parmar saved two set points at 4-5 down in the opening set to force a tie-break and then took advantage of a costly double-fault from his opponent to take it 7-3.
Elsewhere, home favourite Sam Stosur crashed out after throwing away a 5-2 lead in the final set before losing 6-4 1-6 7-5 to China's Zheng Jie .
He then made the decisive break in the third set for 5-4 and served out for the match.
They broke early in the second and, despite being pegged back when serving for the set at 5-4, stormed through the tie-break.
However, the Scot was broken back as he served for the set at 5-4 and the match went into a concluding tiebreak, which proved a classic.
The Dane was struggling at a set and 5-4 down to Maria Sharapova when she lightheartedly asked McIlroy, who was among the audience, for his help.
After Djokovic was broken in the first game of the match, Davydenko served for the first set at 5-4 but the second seed fought back to level.
The worrisome sign for Azarenka is that she needed to go on such a tear after falling behind by a set and 4-0 to the world's 105th-ranked player.
WSJ: Victoria Azarenka: One Is a Lonely Number in Women's Tennis
The American came through 6-4 6-4 to set up a meeting with either Nicolas Massu, Mario Ancic or Raemon Sluiter.
Second seed Caroline Wozniacki came from behind to defeat Bulgarian qualifier Tsvetana Pironkova 3-6 6-3 6-4 and set up a third-round tie with Russia's Maria Kirilenko.
CNN: Djokovic dumped out in Miami; Clijsters and Henin progress
ATHENS, Greece -- World No 1 Justine Henin-Hardenne of Belgium overcame France's Mary Pierce 6-4 6-4 to set up an Olympic semifinal with French Open champion Anastasia Myskina.
Sixth seed Roddick, last weekend's losing finalist, gave home fans some cheer as he crushed Russia's Igor Andreev 6-4 6-4 to set up a clash with Ukraine's Sergiy Stakhovsky.
CNN: Djokovic dumped out in Miami; Clijsters and Henin progress
Williams saved two set points at 5-4 but netted a backhand to hand the Slovenian the first set.
应用推荐