At the end of 2010, the Big 4 had been the top four players in the world for three straight years (some wiggle room there with Delpo winning a slam, but he never finished a year in the top four in the rankings). And at that point there wasn’t a huge gap between Djokovic and Murray – many actually thought Murray had the greater prospects. So there was definitely a Big 4, and Murray for a while was not a distant fourth, as he’d become.