Not satisfied with more rankings milestones and his first three ATP titles this year, Australian tennis star Alex de Minaur hopes to challenge for grand slam spoils in 2020.

"That's the plan. That's the goal. That's where I want to be; playing these top guys in the second weeks of slams so there's a real big effort focused on that," de Minaur told AAP.

Alex de Minaur. Credit:Getty

Seven-times major winner John Newcombe doesn't expect de Minaur to peak for several more years, but the world No.18 is a young man in a hurry.

The 20-year-old is drawing inspiration from Greek sensation Stefanos Tsitsipas, who crowned his season with victory at the ATP Finals in London to confirm his status as the Next-Gen leader to challenge grand slam giants Roger Federer, Rafael Nadal and Novak Djokovic.