If 2017 for Anthony Joshua was about becoming the world's No. 1 heavyweight, 2018 is all about creating his legacy.

''No one is on the journey anymore,'' Joshua said Wednesday. ''We're at the destination.''

Bold words for someone with just 20 professional fights to his name. Then again, Joshua is no normal boxer.

Potentially within four months, the 28-year-old Brit could be the first undisputed world heavyweight champion since Lennox Lewis in 2000, and the first boxer to hold all four belts in the division - WBA, IBF, WBO and WBC.

Stage 1 comes on March 31 when Joshua, the WBA, IBO and IBF champion, fights WBO titleholder Joseph Parker in front of around 80,000 spectators in Cardiff.

If all goes to plan in the Welsh capital, the fight the world wants to see should be next - Joshua vs. WBC champion Deontay Wilder, a meeting of heavyweight boxing's two most destructive punchers.

''It will be in 2018,'' Joshua's promoter, Eddie Hearn, promised.

Joshua knows Wilder is the big one, the fight that will define him even more than last year's epic victory over Wladimir Klitschko before 90,000 at Wembley that rocketed him into boxing's global consciousness.

First of all, however, Joshua has to deal with Parker, a tough New Zealander who arrives in the U.K. with a 24-0 record - 18 of them knockouts - but the least envied of the four belts.

Joshua is looking to close the show with a knockout victory, and hopes to do so in the second half of the contest.

"What I've learned is that boxing is simplified when you incorporate your feet. Even though it's a game of punching people, your feet get you in and out of the way," Joshua told Sky Sports UK.

"So if I can transform what I've worked on in the gym for the last 10 to 11 weeks into the ring then hopefully I can get him out of there between six and eight."