Britain's Jamie Murray and New Zealander Michael Venus continued their quest for a first Grand Slam title together with victory over Austrian pair Alexander Erler and Lucas Miedler.
The 13th seeds edged the Wimbledon debutants 6-7 (5-7) 7-6 (7-3) 6-3.
An emphatic break to love late in the deciding set was the difference in a tight second-round contest.
Later, Briton Katie Boulter and her Australian boyfriend Alex de Minaur are due in mixed doubles action.
British pair Liam Broady and Jonny O'Mara play their opener against Portugal's Francisco Cabral and Brazil's Rafael Matos.