Second Tier Players who have underachived since 2000

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In this case, a second tier player would basically be anyone who's Wawrinka calibre and below (Murray isn't top tier either but he's definitely much better than second tier).

Anyways I think Safin, Tsonga, Nalbandian and Dimitrov are all massive underachievers. Monfils, Gasquet, Fognini and Almagro are all underachivers but I wouldn't consider them as "massive underachievers). Del Potro sort of underachieved too but he got hurt a lot so there's that. Cilic has achieved up to par imo, while Stan the Man overachieved. Hewitt overachieved with his number one stats, while Roddick probably achieved to his ability.

Ferrer and Anderson are the two biggest overachievers though.

Which other second tier players or below since 2000 have underachieved in your opinions?

 

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Disclaimer/Edit: This thread isn't just about second tier players unlike what the title may suggest but it also includes players below 2nd calibre can still qualify for this thread as well.