Vitali Klitschko praises Wladimir's efforts against Anthony Joshua

Vitali Klitschko believes his younger brother Wladimir produced a career-best performance on Saturday night despite losing to Anthony Joshua at Wembley Stadium.

The former heavyweight champion of the world, who is now the Mayor of Kiev, said Wladimir defied 'Father Time' and more than matched the 27-year-old Joshua by out-boxing him during periods of the contest.

"I am very proud of my brother," Vital Klitschko told Bild-Zeitung. "That was his best fight. Unfortunately, the result was wrong.

"He is not too old at the age of 41. He was very quick on his feet, he was great. I even found him better than Joshua who is 14 years younger."

Wladimir does have the contractual option to rematch Joshua if he so wishes, but no decision has been made yet.

Whatever path 'Dr Steelhammer' choses, his decision will be backed by Vitali.

"No matter how Wladimir decides how he plans his future as a sportsman - I will support him with all his strength," Vitali said.