In Pics: Murray, Djokovic enter Wimbledon semi-finals on Day 9

Andy Murray celebrates after battling past Fernando Verdasco 4-6, 3-6, 6-1, 6-4, 7-5 in the quarter-finals. (Getty)



Former Manchester United manager Alex Ferguson reacts while watching the quarter-final between fellow Scot Murray and Spaniard Verdasco. (Getty) 



Murray and Verdasco share a chat at the end of the match. (Getty)



Novak Djokovic plays a shot on the way to his 7-6(5), 6-4, 6-3 victory over Tomas Berdych in the quarter-final. (Getty) 



Juan Martin del Potro reacts after beating David Ferrer 6-2, 6-4, 7-6(5) in the quarter-final. (Getty)



Del Potro is treated for a knee injury during his quarter-final match against Ferrer. (Getty) 



Ferrer plays a shot during his quarter-final tie against Del Potro. (Getty)



Jerzy Janowicz celebrates after cruising past fellow Pole Lukasz Kubot 7-5, 6-4, 6-4 to enter the semi-finals. (Getty)