8. Ezekiel Jackson
Ezekiel Jackson suffered a quad tear while touring with the WWE in the United Kingdom, and quite literally, it could not have come at a worse time. His father had died one month prior, and the day he tore his quad was his dead sister's birthday.
Doctors said that it would take him nine months to recover, but Jackson managed to return to the ring in five. Injuries and surgeries continued to plague him, however, and he never managed to catch fire in the WWE.