Rotterdam, Netherlands  - Andy Murray double-faulted on a match point but didn't let that slight setback stop his progress in a 6-3, 6-2 first-round defeat of Croatian Ivan Ljubicic at the ABN-AMRO World Tennis on Tuesday.

Murray claimed the opening set against the two-time finalist in 40 minutes, then raced off with the second out to 5-0 before his minor slip-up.

Murray's win came with seven aces and four breaks of the Ljubicic serve on an error-filled night for the Croatian who turns 30 next month.

"I had lost two of three matches against him, so I was expecting a tough match," said Murray, fourth in the world. "He had so many errors that it made things easier on me."

Murray next faces Italian Andreas Seppi, who knocked out Rafael Nadal in the second round a year ago when Murray was losing in the first.

"If I serve like I serve did today there are not a lot of guys who can beat me," he said.

French fifth-seed Gael Monfils advanced as Swiss Swiss Stephane Bohli quit injured, 6-4, 1-0. Spain's sixth seed David Ferrer beat Jurgen Melzer 3-6, 7-6 (7-4), 7-5 only a day after flying up from a Johannesburg semi-final at the weekend.

Teenage Bulgarian Grigor Dimitrov, holder of current junior Grand Slam titles from Wimbledon and New York, advanced into a possible second-round clash with Rafael Nadal - assuming the top seed can get past Italy's Simone Bolelli on Wednesday night.

The 17-year-old Dimitrov, ranked 487th, defeated Czech Tomas Berdych 4-6, 6-3, 6-4. Coaching the youngster is new mentor Peter Lundgren, who last worked with Marcos Baghdatis until the end of last season.

Dimitrov was playing only his second ATP-level match, but has been steeled by December fitness training in Las Vegas with Gil Reyes, fitness guru of Andre Agassi.

Dimitrov and Nadal have trained together on occasion.

"He's never given me any tips, but just working with him and watching his game is tips enough - his practice sessions are crazy," said the teenager. "If I play Nadal it will show me what I have to work on in my game."

Nadal will be aiming for a flying start to the Rotterdam week after resting for only a few days following his Australian open title over Roger Federer little more than a week ago.

The world number one lost in the Rotterdam second round last year. dpa