RIYADH – Sergey Kovalev may be forced to face up to the end of his career after losing over 10 rounds to Robin Sirwan Safar in Riyadh, Saudi Arabia.

At his peak he was a fearsome light heavyweight, but that peak came a decade ago and in his second fight at cruiserweight – and his first fight for two years – he consistently struggled to impose himself until being knocked down in the final round and watching Sweden’s Safar awarded deserved scores of 97-92, 99-90 and 95-94.