Rarely successful at the ATP level before, the Dutchman broke through with a semifinal that raised him near the top 50.
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With a title and finals appearance in February, the former top-10 man from Croatia has regrouped quickly from a 2013 suspension.
The Premier Five champion in Doha has burst from nowhere to win seven titles in the last eight months.
Relive the highs and lows of Doha, Rotterdam, Memphis, and Buenos Aires, where Simona Halep, Tomas Berdych, Kei Nishikori, and David Ferrer won titles.
Marin Cilic and Fabio Fognini extended winning streaks, while slumps persisted for Mikhail Youzhny and Sam Querrey.
Even without their best players, Italy still continued their Fed Cup dominance over Team USA.
Plenty of upsets jolted the small ATP tournaments this week, while Fed Cup produced several WTA surprises as well.
Team USA fell behind Italy 2-0 in a Fed Cup quarterfinal, while Andrea Petkovic played the hero for Germany against Dominika Cibulkova.
Young talents and veteran journeymen from Alex Kuznetsov to Bjorn Phau shone in the early rounds this week.
The distinctive features of Davis Cup can produce heroism or anticlimax in equal measure.
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