Andy Murray
Murray made it career win number 499 with victory over Giraldo in Miami. Getty Images

Andy Murray booked his place in the fourth round of the Miami Open with a comfortable straight-sets victory over Santiago Giraldo.

Murray, who inflicted yet more misery on Davis Cup opponent Donald Young in his opening match of the tournament on March 27, was relatively untroubled once again as he eased past the Colombian 6-3, 6-4 in one hour and 24 minutes on a gloriously sunny day at Crandon Park.

Giraldo had previously embarrassed the world number four at the Madrid Masters in February 2014, yet there was to be no repeat this time as Murray broke serve in the fifth game of the first set before withstanding a mini-comeback to close out the second after his opponent had earlier saved two match points.

"I felt like I played a good match," Murray told Sky Sports after his latest win. "When he started really going for it at the end I lost my timing a bit but I managed to close it out at 5-4."

Murray, a two-time champion in Miami, will face Kevin Anderson in round four after the South African saw off the challenge of Leonardo Mayer. Victory in that match would see Murray reach the significant milestone of 500 career wins.