Barcelona, Spain, 27 April 2017 | AAP

Bernard Tomic has withdrawn from his second round-match against Andy Murray at the Barcelona Open due to a lower back injury.

Tomic snapped a streak of five first-round losses in a row on Tuesday when he defeated German journeyman Dustin Brown in three sets.

But just 24 hours later he was unable to take the court, handing world No.1 Murray a safe passage in to the round of 16.