Rafael Nadal reached the final of the Swiss Indoor tournament when he beat Frenchman Richard Gasquet 6-4, 7-6(7) on Saturday, a result that was good news for fellow Spaniard David Ferrer.
Polish qualifier Jerzy Janowicz continued his brilliant run at the Paris Masters on Friday while fourth seed David Ferrer knocked out local favourite Jo-Wilfried Tsonga.
While Roger Federer and Rafael Nadal won their opening matches in straight sets on Saturday, World No. 4, David Ferrer became the first top seed to make an early exit from the BNP Paribas Open.
Fifth seed Andy Murray, sixth-seeded David Ferrer and defending champion Ivan Ljubicic all fell by the wayside on a day of startling upsets at the Indian Wells ATP tournament on Saturday.
Nikolay Davydenko and David Ferrer, seeded two and three respectively, were knocked out of the World Indoor Tournament on Thursday.
Fifth seed David Ferrer beat British teenager Andy Murray 4-6 ,7-6, 6-1 in the second round of the Barcelona Open
Andy Murray took another step towards securing a World Tour finals berth when he fought off a typically dogged David Ferrer to win 6-4, 7-5 and move into the final of the Valencia Open on Saturday.
Defending champion Novak Djokovic was knocked out of the Australian Open quarter-finals by Stanislas Wawrinka 2-6, 6-4, 6-2, 3-6, 9-7 on Tuesday.
Rafael Nadal produced one of his best performances of the year to beat Andy Murray 6-4, 6-1 at the ATP World Tour Finals and move within sight of the semi-finals on Wednesday.
Former US Open champion Del Potro fired down 11 aces and did not face a break point during the one hour, 33 minutes match.
A near flawless Novak Djokovic crushed Marin Cilic 6-0, 6-3 to set up a blockbuster Monte Carlo Masters semi-final with claycourt king Rafa Nadal, who came through a testing workout by David Ferrer on Friday.
Andy Murray took another step towards securing a berth at next month's World Tour finals when he fought off a typically dogged David Ferrer to win 6-4, 7-5 and move into the final of the Valencia Open on Saturday.
Novak Djokovic and Roger Federer notched up contrasting victories to reach the Shanghai Masters quarter-finals on Thursday while David Ferrer fought back from a set down to knock out Andy Murray.
Serena Williams edged past Spain's Garbine Muguruza 2-6, 6-3, 6-2 to reach the quarters.