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Hall of Fame
People keep on resorting to lazy weak era complaints. I don't think mid-2000s or mid-2010s were particularly all that weak. But if you insist on comparing them, let's look at the top 5 players from 2004-2006 vs. 2014-2016 with their slam results that year listed in order of AO, F, W, US:
2004 #1 Roger Federer (W, 3, W, W) vs. 2014 #1 Djokovic, Novak (QF, F, W, SF)
2004 Fed
2004 #2 Andy Roddick (QF, 2, F, QF) vs. 2014 #2 Roger Federer (SF, 4, F, SF)
2014 Fed
2004 #3 Lleyton Hewitt (4, QF, QF, F) vs. 2014 #3 Nadal, Rafael (F, W, 4, DNP)
2014 Rafa narrowly
2004 #4 Marat Safin (F, 4, 1, 1) vs. 2014 #4 Wawrinka, Stanislas (W, 1, QF, QF)
2014 Stan
2004 #5 Moya, Carlos (DNP, QF, 4, 3) vs. 2014 #5 Nishikori, Kei (4, 1, 4, F)
Too close to call
2005 #1 Roger Federer (SF, SF, W, W) vs. 2015 #1 Djokovic, Novak (W, F, W, W)
2015 Novak
2005 #2 Nadal, Rafael (4, W, 2, 3) vs. 2015 #2 Murray, Andy (F, SF, SF, 4)
2015 Murray
2005 #3 Andy Roddick (SF, 2, F, 1) vs. 2015 #3 Roger Federer (3, QF, F, F)
2015 Fed
2005 #4 Lleyton Hewitt (F, DNP, SF, SF) vs. 2015 #4 Wawrinka, Stanislas (SF, W, QF, SF)
2015 peak Stanimal
2005 #5 Davydenko, Nikolay (QF, SF, 2, 2) vs. 2015 #5 Nadal, Rafael (QF, QF, 2, 3)
Too close to call
2006 #1 Roger Federer (W, F, W, W) vs. 2016 #1 Murray, Andy (F, F, W, QF)
2006 Fed
2006 #2 Nadal, Rafael (DNP, W, F, QF) vs. 2016 #2 Djokovic, Novak (W, W, 3, F)
2016 Novak
2006 #3 Davydenko, Nikolay (QF, QF, 1, SF) vs. 2016 #3 Raonic, Milos (SF, 4, F, 2)
Too close to call
2006 #4 Blake, James (3, 3, 3, QF) vs. 2016 #4 Wawrinka, Stanislas (4, SF, 2, W)
2016 Stan
2006 #5 Ljubicic, Ivan (QF, SF, 3, 1) vs. 2016 #5 Nishikori, Kei (QF, 4, 4, SF)
2016 Kei
Results are 10-2 with 3 ties for 2014-2016 being stronger than 2004-2006.
2004 #1 Roger Federer (W, 3, W, W) vs. 2014 #1 Djokovic, Novak (QF, F, W, SF)
2004 Fed
2004 #2 Andy Roddick (QF, 2, F, QF) vs. 2014 #2 Roger Federer (SF, 4, F, SF)
2014 Fed
2004 #3 Lleyton Hewitt (4, QF, QF, F) vs. 2014 #3 Nadal, Rafael (F, W, 4, DNP)
2014 Rafa narrowly
2004 #4 Marat Safin (F, 4, 1, 1) vs. 2014 #4 Wawrinka, Stanislas (W, 1, QF, QF)
2014 Stan
2004 #5 Moya, Carlos (DNP, QF, 4, 3) vs. 2014 #5 Nishikori, Kei (4, 1, 4, F)
Too close to call
2005 #1 Roger Federer (SF, SF, W, W) vs. 2015 #1 Djokovic, Novak (W, F, W, W)
2015 Novak
2005 #2 Nadal, Rafael (4, W, 2, 3) vs. 2015 #2 Murray, Andy (F, SF, SF, 4)
2015 Murray
2005 #3 Andy Roddick (SF, 2, F, 1) vs. 2015 #3 Roger Federer (3, QF, F, F)
2015 Fed
2005 #4 Lleyton Hewitt (F, DNP, SF, SF) vs. 2015 #4 Wawrinka, Stanislas (SF, W, QF, SF)
2015 peak Stanimal
2005 #5 Davydenko, Nikolay (QF, SF, 2, 2) vs. 2015 #5 Nadal, Rafael (QF, QF, 2, 3)
Too close to call
2006 #1 Roger Federer (W, F, W, W) vs. 2016 #1 Murray, Andy (F, F, W, QF)
2006 Fed
2006 #2 Nadal, Rafael (DNP, W, F, QF) vs. 2016 #2 Djokovic, Novak (W, W, 3, F)
2016 Novak
2006 #3 Davydenko, Nikolay (QF, QF, 1, SF) vs. 2016 #3 Raonic, Milos (SF, 4, F, 2)
Too close to call
2006 #4 Blake, James (3, 3, 3, QF) vs. 2016 #4 Wawrinka, Stanislas (4, SF, 2, W)
2016 Stan
2006 #5 Ljubicic, Ivan (QF, SF, 3, 1) vs. 2016 #5 Nishikori, Kei (QF, 4, 4, SF)
2016 Kei
Results are 10-2 with 3 ties for 2014-2016 being stronger than 2004-2006.