Milos Raonic expects the first-time grand slam successes of last year to continue in 2015, insisting the 'Big Four' will be challenged.
Stanislas Wawrinka and Marin Cilic both managed to break through in 2014, winning the Australia and US Opens respectively.
Wawrinka's success in Melbourne marked the first time since the 2009 US Open, which Juan Martin del Potro won, someone outside Novak Djokovic, Roger Federer, Rafael Nadal and Andy Murray had tasted grand slam success.
Raonic believes that can continue, with the big-serving Canadian, Kei Nishikori and Grigor Dimitrov seemingly the most likely candidates.
"I think we can step up and give ourselves a possibility to win at the bigger tournaments," he told a media conference on Sunday.
"But I don't think there's going to be somebody stepping up like Roger, Rafa and Novak did a few times winning three out of four slams.
"I think there will be an opportunity for one of us to step up and have an opportunity to win their first slam."
Raonic believes those yet to win a grand slam, but are challenging, are approaching "peak maturity".
The 24-year-old reached the Brisbane International final to begin his season, losing to Federer.
Raonic is happy with his form and said he had put plenty of time into the mental side of the game.
"I feel like I'm playing well. I feel like I'm able to sort of organise my game and do the things I want to do, which is important," he said.
"We spent a lot of time working on fitness. We spent a lot of time, through discussion, working on the mental side of things, how I want to deal with things, especially at important moments against top players. All these kind of things.
"We had about three-and-a-half weeks to really sort of just buckle down and put in the work."