Being on the card for the first megafight on Chinese soil carries with it a certain amount of pressure to put on a show and nobody is more keenly aware of that now than Tor Hamer.

Just two fights before Manny Pacquiao and Brandon Rios were set to make history in Macau on Saturday (Sunday local time), the American heavyweight erred on the side of self-preservation and quit on the stool after the fourth round of an action-packed (albeit short) bout against Andy Ruiz Jr.

The move wasn't well-received by his promoter, Lou DiBella.

By the way, Tor, you are released. WTF!!! — Lou DiBella (@loudibella) November 24, 2013

For what it's worth, DiBella did wish him luck moving forward.

The ending came as a surprise to those in the media and fans at CotaiArena, the latter of which rained boos on the New Yorker for his conscious decision to quit.

Hamer and Ruiz had plenty of quality exchanges in the first two rounds of the fight, but Ruiz landed more frequently. That momentum seemingly gave Ruiz confidence and the Mexican used his weighty frame to unload on Hamer's body and head in the third and fourth rounds, which prompted Hamer to call it a night.

Ruiz Jr. remained unbeaten in 21 professional fights and retained his WBO intercontinental heavyweight title, in addition to winning the vacant NABF international heavyweight title.

Hamer, meanwhile, is now out a promoter and may have trouble landing another major gig.