No thread? Chung scored his first clay court win with a straight sets win over fellow qualifier Arguello.
Not just first ATP level win, but first match. At least for two days he's got a better winning percentage on the surface than Nadal.What OP is saying is correct in a way.
This is his first clay win at ATP level. The first which will be recorded in his Performance chart. Qualifying or Challenger wins don't count for that.