There were also wins for Thiemo de Bakker, Sam Querrey, Thomaz Bellucci and Michael Berrer.
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And Berrer charges to the net to calmly stab the ball away with a sweet back-handed volley.
Berrer is lurking at the net again and BOOM - a fab forehand winner gives the Brit the advantage.
The other winners on Tuesday were Tommy Robredo of Spain, German duo Bjorn Phau and Michael Berrer, and Somdev Devvarman of India.
"A crucial game for Berrer" says Andrew Castle and it's deuce again.
"He's going to the well quite a lot but the well is dry" says Andrew Castle regarding Berrer's failed attempt on another sliced dropshot.
Berrer was no match for the second-seeded Spaniard, who made just eight unforced errors on his way to a 29th successive victory in the principality.
Nadal beat Dutchman Thiemo de Bakker 6-1 6-0 on Wednesday -- and the five-time champion dished out another clay-court masterclass to sweep past German Berrer by the same scoreline.
Djokovic, who struggled past Germany's Michael Berrer in the first round, broke his opponent six times on his way to a 6-1 6-3 victory in one hour and 14 minutes.
Meanwhile, top seed Marin Cilic won his opening match at the BMW Open in Munich, moving into the second round as he completed a rain-delayed 6-4 6-2 victory over Michael Berrer on Wednesday.
"There's a good variety in this match" says John Lloyd. plenty of variety in that rally - a great combination of dropshots from Berrer, Murray hangs in there and the German wastes a golden opportunity at the net.
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