Top seed Federer was taken all the way by Latvian Ernests Gulbis before going through 6-2 4-6 6-4, while Nadal had a simpler task to overcome Belgian Steve Darcis -- who retired while trailing 6-1 2-0.
In a recent study by the developmental psychologist Laurence Steinberg at Temple University, teenagers did a simulated high-risk driving task while they were lying in an fMRI brain-imaging machine.
Archaeological tools in Gaza are rudimentary - not ideal for the delicate task of unearthing fragile relics - and while local expertise is not poor, specialists from outside rarely visit.
Web Workers, for instance, is an emerging system for isolating a browser's individual tasks into separate "threads, " making it easier for a browser-based program to perform a computationally intensive task such as photo-editing in a background tab while the user is attending to something else, like e-mail, in the foreground.
Congressional Republicans are taking secretary-designate Alexis Herman to task for campaign-related work she performed for President Bill Clinton while serving as director of the White House public liaison office.
New York was looking to shake off its 5-2 loss on Sunday while focusing on the task at hand.
Accordingly, in "Saving Normal, " Dr. Frances attempts the delicate task of debunking the DSM-5 while justifying his own DSM-IV.
The use of these sophisticated weapons, precisely targeted by global positioning satellites, is designed to maximise their effects while limiting collateral damage, which would make the task of post-war reconstruction more difficult.
And I think it's -- to take a step back here -- not to diminish the task that the committee faces, but while it is challenging because of the politics, at a substantive level, it is not that complicated.
While changing these federal regulations appeared to be an insurmountable task for this small start-up to accomplish on its own, Rusnano helped the company convince policymakers to change the regulations.
Ngog had the arduous task of leading the Liverpool line almost single-handedly and, while he worked tirelessly, he failed to make the most of a rare chance which came his way.
The new tablet is powered by Intel's Atom system on a chip and can run Windows 8 Snap Mode, allowing students and teachers to easily multi-task between two applications, such as interacting with a remote teacher via Skype while taking notes in Microsoft OneNote.
ENGADGET: Dell Latitude 10 essentials trim pushes pro Windows 8 tablets down to $499 (video)
Irish now face the daunting task of ensuring a bonus-point win over reigning champions Leinster at Twickenham next Saturday while denying the visitors a losing bonus point.
While technology could enhance our driving experience, it also could clutter our lives by compelling us to multi-task and creating extra demand for our attention and energy.
Stephen Morrison, co-chair of the Center for Strategic and International Studies' Sudan Task Force, argued that while such sanctions may prove an "innovative instrument, " there are too many uncertainties surrounding their use to proceed without detailed groundwork being laid.
While it would be a formidable task to check every study Wagenaar et al. subsumed in their meta-analysis, a quick check to find out whether they included a study with a known systematic bias reveals the study included Chesson et al., a study by the Centers for Disease Control which claimed that increased beer taxes could reduce the rate of gonorrhea.
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