Here's what time tonight's Anthony Joshua vs. Joseph Parker fight starts where you live — and how you can watch it live online

Unbeaten heavyweight champions Anthony Joshua and Joseph Parker will face off on March 31.
There are four heavyweight titles on the line in this unification bout which airs on Sky Sports Box Office and Showtime.
The Joshua vs. Parker bout is expected to begin at around 10 p.m. BST which means a 5 p.m. start for viewers in New York.
Here's everything you need to know.

A world heavyweight championship unification fight is scheduled to take place at the Principality Stadium in Cardiff on Saturday, March 31.

Fighting out of one corner is WBO title holder Joseph Parker, a power puncher from New Zealand. Out of the other corner is WBA, IBF, and WBA champion Anthony Joshua, a bruising big man with a terrifying record of 20 knockout victories from 20 professional contests.

Over 70,000 tickets have already been sold and because there are many other boxing bouts on the night, the doors at the stadium are expected to open at around 5.30 p.m. local time (BST).

This means the broadcast for the show's main fights will likely air at 8 p.m, with the Joshua vs. Parker showdown expected to begin at 10.p.m. BST.

Here's what time the fight will start in major cities across different time zones on Saturday, March 31:

Joshua is a renowned entity in world sports because he has been involved in thrilling fights.

The popular British boxer laughed off an in-ring riot to flatten old amateur rival Dillian Whyte with a crushing right uppercut in 2015, got off the canvas to knock out former long-reigning heavyweight champion Wladimir Klitschko in 2017, and almost had his nose split in half when Carlos Takam headbutted him in his most recent outing last October.

Here's example of Joshua's terrifying ability:

Round of 2017? Anthony Joshua vs Wladimir Klitschko - Round 5

Parker, like Joshua, is an unbeaten heavyweight. The 26-year-old won his WBO heavyweight world title with a decision win over Andy Ruiz Jr in 2016 and has successfully defended the belt twice, including a slim points win over Tyson Fury's cousin, Hughie Fury, last September.

Watch Parker in action here:

If you're not one of the lucky ticket holders, you can watch Joshua and Parker trade blows live online.

The Anthony Joshua vs. Joseph Parker heavyweight fight will be broadcast on Sky Sports' Box Office platform. This means viewers are expected to pay a fee. This has not yet been revealed but it is expected to be £19.95 ($27.86).

Non Sky Sports subscribers will still be able to watch the fight online, but will also have to pay the Box Office fee to watch the fight.

UK audiences can watch the fight live online right here.

US audiences will also be able to get in on the action as Showtime is broadcasting the fight State-side from 5 p.m. (ET).

An online subscription to Showtime costs $11 (£7.85) a month and you can access it through Apple TV, iPhone, iPad, iPod, on a Roku, via Hulu, or through Sony's PlayStation Vue.

To stay up-to-date with the Joshua vs. Parker fight on Showtime, click here.

Anthony Joshua vs Joseph Parker | Live on Sky Sports Box Office | 31st March 2018