The Briton made a slow start against an opponent 103 places
below him in the world rankings but he broke Copil's serve in
the 10th game to take the set and found his feet in the second
after breaking at 3-2.
He finished off the big-serving Romanian in 83 minutes without
having faced a break point.
Murray, runner up in Madrid last year to Novak Djokovic, is
likely to face a real test of his number one status at the
tournament where anything less than a final berth will reduce
his overall ranking points.
Crowd favorite Rafael Nadal will make his first appearance at
the tournament he has won a record four times when he meets
Italian Fabio Fognini on Wednesday.
Nadal has made a flying start to the claycourt season by winning
the Monte Carlo Masters and the Barcelona Open for a
record-extending 10th time.
World number two Djokovic will meet Nicolas Almagro, who won an
all-Spanish affair against Tommy Robredo 6-3 3-6 6-1.
(Reporting by Richard Martin; Editing by Toby Davis)
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