Reigning champion Andy Murray moved into the quarter-finals of the Madrid Masters here on Thursday with a 6-2, 6-2 win over Giles Simon after a brief pause in the second net as a spectator needed medical attention in the stands.

Murray was joined by top seed Novak Djorkovic who needed just one hour and eight minutes before qualifying for the quarters with a straightforward 6-2, 6-2 win against Spaniard, Roberto Bautista Agut.

Home favorite Rafael Nadal overcame a slow start before fighting back to what turned out to be a straightforward 6-4, 6-2 win over American Sam Querrey in just over an hour and 10 minutes.

However, his fellow Spaniard, David Ferrer failed to make it through as the number 9 seed lost 7-6 (8), 7-5 to number 8 seed, the Czech Tomas Berdych.

Number six seed Kai Nishikori is also into the last 8 after his 6-4, 7-5 victory over French number 10 seed, Richard Gasquet.

Simona Haleb is the only seeded player in the semi-finals after a strange 3 set victory over fellow Romanian, Irina Begu. Haleb lost the second set to love before recovering to run out a 6-3, 0-6, 6-1 winner.

Qualifier Louisa Chirico, who is ranked 130th in the world, is also a shock semi-finalist after her 7-6 (1), 6-2 triumph over Australian, Daria Gavrilova.