Del Potro achieved a top 10 ranking by the Association of Tennis Professionals for the first time on October 6, 2008. In April 2009, he reached a career-high ranking of World No. 5.
In August 2008, he became the first player in ATP history to win his first four career titles in as many tournaments. He also completed the second longest winning streak in 2008, and the second longest by a teenager in the open era, behind Rafael Nadal — with his winning sequence spanning 23 matches over five tournaments.
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