The "Big 4" (or rather the "Big 3" and Murray for now) have occupied the top 4 slots in the rankings for the majority of almost 4 years now. During that time, a select group of talented players (listed below) have challenged them and were ranked in the top 5 or 6 at some point or another. Who's been the best among them since the current top 4 established their order? Nikolay Davydenko: He beat Federer and Nadal at the 2010 WTF and again in 2011 Doha. He has since been falling in the rankings. Spent 24 weeks in the top 5 since Murray reached #4 Andy Roddick: Defeated Murray at 2009 Wimbledon, almost beat Federer in the finals. He also defeated Djokovic at AO 2009. Spent a total of 8 weeks at #5 since Murray reached #4. David Ferrer: Now seems to be the consistent #5 player in the world. Beat Nadal at the 2010 AO and Murray at 2012 RG. Spent 38 weeks in the top 5 since Murray reached #4. Jo Wilfried Tsonga: Only player to have beaten Federer, Nadal, and Djokovic in majors. He possibly has the best game among all the players in this list when he's on fire. Spent a total of 11 weeks at #5 since Murray reached #4. Tomas Berdych: Made the 2010 Wimbledon finals, defeating Federer along the way. Possibly the best FH+BH combo in this list, but he is yet to reach the top 5 in the rankings. Robin Soderling: He is the only player to beat Nadal at the French Open (2009) and ended Federer's streak of consecutive SF (RG 2010). He has made 2 major finals, the most of anyone on this list since Murray climbed up to #4. He has spent a total of 55 weeks in the top 5 (including a considerable stint at #4) since Murray broke into the top 4. However, he has since fallen off the rankings due to illness. Juan Martin del Potro: Only player to have won a major in this list (2009 USO) during the given time period, where he defeated Nadal and Federer in back to back matches. Defeated Federer again at the 2009 WTF. He dropped down in rankings as a result of injuries but is steadily climbing back. He spent 45 weeks ranked in the top 5, with a few weeks at #4.