He gained the decisive break early in the second set when Ljubicic sent a backhand sailing wide.
Azarenka said she altered her approach in the second set and became more aggressive.
Stosur took a 3-0 lead in the second set and held the rest of the way.
The second set of tables reflects the group play predictions from each of the surveyed inputs.
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Federer then broke serve in the ninth game of the second set to set up victory.
Clijsters looked vulnerable throughout the second set and had to save a matchpoint at 4-5.
"She had more firepower and really started firing, especially in the second set, " said the Scot.
The second set, applying to individual counties, is published, uncodified, in separate annual editions.
Nadal did not let up in the second set, and perhaps even stepped up a gear.
And the Argentine was in great form as he broke four times in the second set.
But Australian Open runner-up Schuettler battled back on Sunday to capture the second set.
Serving at 4-5 in the second set, she erased three set points and held.
The second set was tighter, with Del Potro having a break point in the sixth game.
Maybe in the second set at 5-5, 15 30 but he served really well all match.
As Oudin came back for the second set, the crowd held its collective breath.
The second set was a complete switch, with Davenport struggling and Henin-Hardenne finding some form.
In the second set, he fell behind 5-3, recovered and then lost a tiebreaker.
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When she first injured her ankle, Li was trailing 3-1 in the second set.
After losing the second set I really went down and lost all my confidence.
Kuerten broke Agassi twice to win the second set, and served two games to love.
Once I got the break in the second set, I started to play better.
"I lost faith in my game and my repertoire of shots in the second set, " said Corretja.
"I felt at the beginning of the second set I was starting to return better, " said Federer.
They appeared to be coasting toward victory in the second set, too, until Kessy remembered her gum.
Sharapova had 57 unforced errors, including 13 double-faults, and overcame three set points in the second set.
But Schuettler hit back impressively, breaking the formidable Spaniard's serve in game three of the second set.
The Australian broke Escude in the sixth game of the second set with a cross-court service return.
The second set followed a similar pattern, with both players trading breaks, but Soderling looking the more solid.
The second set was equally competitive with the world No.6 eventually prevailing in a more even tiebreak contest.
Clijsters' breakthrough in the second set came after breaking Wozniacki to lead 4-2 and take the next game.
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