Two rematches headline the Manny Pacquiao vs. Mario Barrios undercard, while former champions and young contenders look to impress. Here's a breakdown of all the action on the Pacquiao vs. Barrios card.

It’s been four years since Manny Pacquiao’s last bout – and six since his last win – and now a veteran trainer has called out his comeback as a ‘set up’ giving the legend ‘one last shot’ at a belt. Jeff Mayweather – the uncle of the legendary Floyd Mayweather – said it best this week.

Each card contains world title fights and big names, with fights ranging from Oleksandr Usyk vs. Daniel Dubois for the undisputed heavyweight championship to Manny Pacquiao ending his retirement at 46 to fight Mario Barrios for the WBC welterweight championship.

Pacquiao and his wife were assessed a $55.8 million tax bill, including penalties and interest, for allegedly failing to completely pay what he owed between 2008 and 2009, taking issue with his failure to report U.S. earnings. Pacquiao claimed he paid the taxes in the U.S.