Juan Martin del Potro got a big win last week over fellow big man John Isner in Montreal, but then he lost to wild card Denis Shapavalov. In Cincinnati this week, he upset Tomas Berdych before falling to Grigor Dimitrov.

His comeback has been filled with highs and lows. The 28-year-old is ranked No. 30 after a slow climb back up the ranks since returning last year. But will the former world No. 4 ever return to Top 10 glory?

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