Roddick win was good, fair play. He beat baby Del Potro, hardly a big scalp. He beat Verdasco before he boomed, Nalbandian in the first round at Wimbledon which isn't so hard. Is beating Kohlschreiber really that impressive? Yes, lots of players take sets off the top guys occasionally.
Fact is, over a ten year career like Dancevic's, if he was really capable of this god-like tennis that you claim he is, he would have beaten better players than you've mentioned. I just don't see it.
He took a set of Nadal because he played 1 really super good return game. Baby Dimitrov also took a set of Nadal a couple of years back, so is that really that impressive?
All the player in the top 500 can play 1 great match a season, it's just the World Top that plays consistently to be named elite. The stuff that seperates the men from the boys.
Former #1 in FITD (Titles: 11 / US Open 2009 + MS Shanghai 2010 + MS Cincinatti 2011 champion)
also: Bangkok 2008, Sydney 2009, Acapulco 2009, Dubai 2009, Båstad 2009, Stockholm 2009, Eastbourne 2010 & Auckland 2013
Former #1 in Suicide Tennis (Titles: 2 / Won: 9)
#138 in TT Singles (Titles: 3 / CH Ortisei 2010, CH Bratislava 2010 & CH Mons 2012) | ATP Zagreb F 2013
#118 in TT Doubles (Titles: 9 / CH Rome 2011 + CH Ostrava 2011 w. vn01, CH Madrid 2012 w. Rodrigol_87, CH Sheffield 2013 w. sdtoot, CH Rome 2013 + CH Bordeaux 2013 w. Sonja1987, CH Prostejov 2017 w. Mago#01 & CH Perugia 2017 w. kirilenko-fan)| ATP Los Cabos 2017 w. daniel_amr