Inb4 2014-2016 >>> 2004-2006.Tsisipas has absolutely nothing to do with Federer and Djokovic's eras!
Federer's era of 2000's was weak, because for most of it teenage Nadal was the 2nd best player.
Djokovic's era of the 10's was strong, because Nadal was out teenage years and in his prime, Federer was still near his prime. And you have 3 very good players: Murray, Wawrinka and Del Potro, who were all better than prime Roddick, the 3rd best player in the 2000's.
BTW, which was the match of the day Friday? Shapo-Fritz or Tsis-Coric! Many of these young players would make a killing in the 2000's.