The WBO is the youngest and many would say least prestigious of the recognised boxing administrations. Started in 1988 by disaffected members of the WBA, their first heavyweight title fight was a low-glamour match-up between Francesco Damiani and Johnny du Plooy.
Damiani would KO du Plooy (who became grossly overweight in retirement and died in 2013) in the third round, but his reign ended at the end of a Ray Mercer uppercut and his career ended when beaten by Oliver McCall, a troubled man who upset Lennox Lewis but is best remembered for a tearful breakdown during the rematch.
It is the breakdown of another of its champions, Tyson Fury, that has led to the vacation of the belt and the opportunity for Parker and Ruiz Jr.
Fury was also WBA heavyweight champ, the oldest and perhaps grandest of the four organisations recognised by the IBHOF. The World Boxing Association was once based in the USA and was known as the NBA. It is now based in Panama City and can no longer be confused with the basketball giant.
The World Boxing Council was formed in Mexico City in 1963, and has 161 'member' countries. The WBC has gained a reputation for being dismissive of its three rivals and extremely friendly with Don King.
The IBF, are you still with us, was formed in New Jersey in 1983 after the head of the United States Boxing Association (USBA), failed in his bid for WBA presidency. It was initially called the USBA-IBF but that was just silly.
The WBO, as mentioned, was also formed out of a dispute between WBA members. This time, a group of mainly Puerto Rican and Dominican members left to form the WBO in San Juan.
The IBF's heavyweight champion is British star Anthony Joshua. The WBO's is up for grabs on Saturday.
Duco make no secret of the fact they would dearly love their young superstar to fight Joshua in a partially unifying bout that could make a lot of money for a few people.
For that to happen, first Parker has to beat Ruiz Jr.
Not only that, there is another three-lettered title Duco (and Sky TV) desperately want him to win: the PPV Championship.
As it stands, David Tua and Shane Cameron's 3m 15s bloodbath is the clear pay-per-view leader, and at $59.99 Duco are going to hope that a lot of boxing's "gritty" devotees are prepare to shell out to watch this title fight.
Incidentally, Ruiz Jr and his small coterie have set up base camp at the Langham in uptown Auckland. The Langham is famous for its old-money sensibilities and its high tea.
The high tea is about $60 per person.
Any takers?
