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Input: Forget the Winter Olympics  the Champion's League or the Super Bowl. The real competition right now is who's going to be invited to  Prince Harry  and Meghan Markle's wedding.
British heavyweight boxer Anthony Joshua  who is seeking to add two more world championships to the three he already owns  says he would be happy to interrupt his high-level training for a trip to Windsor Castle on May 19. The ebullient Joshua has not been shy  tweeting a picture of himself and Harry with the question "Need a best man?"
Any bride and groom run into parental interference in their guest list  whether it's adding random cousins or forgotten neighbors. Yet  Harry  and Markle are enduring this phenomenon at a cosmic level due to the royal expectations that come along with being a grandson of Queen Elizabeth II.
At least  Harry  and Markle won't face the 3 500 guests that  his  parents  Prince Charles and Lady Diana Spencer  welcomed to their 1981 "wedding of the century" in St. Paul's Cathedral in London. They also avoided the warehouse-sized Westminster Abbey  where Harry's brother Prince William and Kate Middleton packed in 1 900 guests for a 2011 royal wedding extravaganza televised around the world.
The British royals' close relatives alone number over 50 â and this time Princess Eugenie gets to bring a plus-one  fiance Jack Brooksbank.  Harry  also won't forget non-royals like Kate's sister  Pippa Middleton  her husband James Mathews  and brother James Middleton.
William barely could squeeze in A-listers like David Beckham and TV adventure host Ben Fogle â who may return for  Harry 's nuptials.
The juiciest debate has been over invites for rival U.S. presidents Barack Obama and Donald Trump.  Harry  and Obama have obvious chemistry and have worked together promoting  Harry 's Invictus Games competition for wounded soldiers. Some British officials  however  fear that an invite to Obama would anger Trump.
The royals could note that Obama  the U.S. president in 2011  was not invited to William's wedding. And they have a bit more leeway because  Harry 's wedding is not considered a state event. Markle  meanwhile  is a Hillary Clinton fan.
"We've changed our minds on this. We think  Harry  is in a position that  he  does not have to worry about the political implications of an invite " said Rupert Adams  a spokesman for the betting agency William Hill PLC. "We feel strongly that the Obamas will get an invite."
Canadian Prime Minister Justin Trudeau has a trifecta of ties to the bride and groom: He's the head of a Commonwealth country  host of  Harry 's latest Invictus Games and leader of the nation where Markle had been living.
On the celebrity front  Elton John  who turned his song "Candle in the Wind" into an anthem for the late Princess Diana  is considered a 1-50 lock for an invite (98 percent chance) and singer James Blunt comes in at 1-4. Singer/songwriter Ed Sheeran is also reportedly close to  Harry 's royal cousins and his U.K. tour doesn't start until a few days later.
Violet von Westenholz who introduced the couple will get a nod  along with  Harry 's buddies Thomas and Charlie van Straubenzee  Thomas Inskip and Arthur Landon.
Yet A-listers could find themselves outnumbered by British military members and charity workers. Look for dress uniforms from both the Blues and Royals regiment and the Army Air Corps  since  Harry  served as a former Apache helicopter co-pilot in Afghanistan.
"The simple reality is ... we have been focusing on Harry over here " Adams said.

Royal wedding guess list: Who gets a nod from Harry  Meghan?