4 Superstars who benefited from another's injury and 3 who suffered 

#5 Rey Mysterio (Benefited in 2010)

Rey Mysterio won his second World Title at Fatal Four-Way 2010

Rey Mysterio has got to be one of the most decorated Superstars in the history of WWE. Not only has he been a part of uncountable amazing feuds and matches, but he has also won many Championships during his first run with WWE.

He is a three-time World Champion and a former Royal Rumble winner, a match he won by setting a new longevity record.

However, the Master of 619's 2010 World Title reign was due to an injury suffered by The Undertaker in a match against Mysterio himself.

The winner of that match would go on to secure a spot for himself in the Fatal Four-Way match for the World Heavyweight Title at the namesake Pay-Per-View. The Undertaker ended up winning the match.

During the qualifying match however, The Undertaker suffered a broken orbital bone, causing him to miss a few months of in-ring action.

The Undertaker's spot was left vacant and a battle royal was held to determine the final contestant. Mysterio ended up winning the battle royal and also went on to win the Fatal Four-Way to win his second World Title.

Although Mysterio's reign lasted only a month, he still got to become the World Champion. This wouldn't have been possible, had The Undertaker not suffered an injury right before the event.