Murray has taken his record for 2007 to 18 wins in 21 matches

The 19-year-old Scot reached his third Masters Series quarter-final with a 7-6 (7-3) 6-4 win, sealing victory with his 10th ace of the match.

He next faces eighth seed Tommy Haas, who beat Fernando Gonzalez 6-3 6-2.

"I served a few aces and on the important points hit some big serves," said the British number one.

Interview: Andy Murray

606: DEBATE Well played Andy - you looked like the number four in the world not Davydenko WF

After being broken in the opening game, Murray won three in a row and later battled from 0-30 to go 4-3 up before winning the tie-break 7-3.

An early break in the second set proved decisive as Murray took the upper hand.

Despite a wobble in the eighth game, Murray never let slip the advantage he took early in the set and won it 6-4.

"I was a bit nervous at the end but managed to come through it. This court is a little bit slower I think than the other ones.

"It didn't bounce like the outside courts, it took a while to get used to. I'm happy with how I adjusted."

On the same side of the draw, Murray's friend and fellow 19-year-old Novak Djokovic beat Julien Benneteau 6-3 6-1.