The former world number one entered the tournament optimistic, but will now have to search for more answers
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As clay season begins, the former world number one will look to make positive strides
The Argentine is looking to win the Sunshine Double at Miami
The 21-year-old reached the semifinals at Indian Wells last week
The German hopes to avoid a sophomore slump this season
With a win against Robin Haase, the Swiss will become the oldest man to hold the world number one ranking
The German has reached a career-high ranking
As a group of Next-Gen players look to make their mark on the tour, some older veterans are having late-career resurgences.
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