Luncanu has some of his biggest carrer wins on indoor courts, so he can play on this surface:
2008 - 6-2 6-4 vs Klizan
2009 - 6-7 6-4 6-4 vs Fabrice Martin
2010 - 6-4 6-1 vs Jouan
2010 - 7-5 6-2 vs Donskoy
2011 - 6-4 6-7 7-6 vs Lorenzi
They are not big names, just regular Challenger Tour player, but for an average futures-level claycourter like Luncanu these are significant wins.
he is not a claycourter. his favourite surface is hard.
on junior level Mergea won Wimbledon(both singles and doubles), played final at Australian Open (both singles and doubles) and won orange Bowl. He beat Murray, Monfils, Tsonga, Berdych, Guccione and many others. So he enjoy fast surfaces
Andrei Daescu was #2 in USTA College Circuit where he played for Oklahoma University. You realise that he "ate" only hardcourts over there.
Bragusi also played a lot of futures in France, on hard