Nadal booked easy passage, with the Spaniard showing no mercy against Marcos Daniel as the Brazilian quit trailing 0-6, 0-5 with a knee injury.
Fifth seeded Murray required just over 100 minutes for his own easy win, achieved as Slovak Karol Beck was forced to end it early with a shoulder problem 3-6, 1-6, 2-4 to the Scot.
Image: Spain's Rafael Nadal, left, pats Brazil's Marcos Daniel on the back after Daniel withdrew from their first round match with a knee injury at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 18, 2011.
Text: IANS
Images: AP