Big-serving Canadian Milos Raonic delivered 19 aces on his way to the second round of Wimbledon on Tuesday and promised plenty more as he seeks to live up to his billing as one to watch.

The 22-year-old, whose height of nearly two meters gives him an advantage with his serve even without the attention he has given to developing it, easily beat Argentine Carlos Berlocq 6-4, 6-3, 6-3 to set up a meeting with Dutchman Igor Sijsling.

"It's a lot of work," the 17th seed told Reuters in an interview when asked what the key to his strong serve was.