The Canberran booked a second-round clash against the Bulgarian with a 6-4, 7-5 win over American wildcard Denis Kudla in his first match back from an injury-enforced break after making the Australian Open quarter-finals.

Kyrgios said he was pleased with his performance returning from back surgery which kept him out of Australia's Davis Cup quarter-final win over Czech Republic.

Fifteen of the world no. 37's career top-flight wins have been posted at grand slams or in the Davis Cup.

His next challenge is proving his body can handle the grind of the tour week after week.

"I'm just glad to be back. It was killing me not being able to play, especially after the Australian Open," the 19-year-old told the ATP Tour website.

"I had a good time back home, and I was ready to get back out there and start competing again."

A noted big game player, Kyrgios is relishing the chance to test himself against Dimitrov, rated one of the potential successors to the 'Big Four' when they move on.

"He's one of the best players in the world right now and that's why I play the sport, to have a chance to go out there and compete against the best," he said.

"I'm just going to go out there and have a lot of fun again."

Fellow Australians Bernard Tomic and Thanasi Kokkinakis are one win away from an enticing clash after rolling into the third round with impressive wins in the Californian desert.

Cashing in on his wildcard entry, Kokkinakis upset 23rd seed Guillermo Garcia-Lopez 7-5, 5-7, 6-3 on Saturday to reach the last 32 of a Masters Series event for the first time.

Australia's teenage Davis Cup star next plays Juan Monaco after the Argentine surprised US Open champion Marin Cilic, the 10th seed, 6-4, 6-4 in his second-round match.

Tomic beat exciting young Croatian Borna Coric 6-3, 6-4 to book a meeting with Spanish eighth seed David Ferrer, a 4-6, 6-1, 7-6 (8-6) winner over Ivan Dodig.