Toughest fight of Lewis' career?

Vitali then Mercer.

 

Mercer. That decision could have went to Mercer. Razor close fight.

The tiny ring, mercers granite chin and non stop come forward attitude was a nightmare for lennox

 

Strange that considering you often hear Mike Tyson was apparently past his prime at 23. If only he knew he only had another 14 years of boxing to go before he actually reached his prime age of 37.

 

I’d say the Mercer fight because Lewis chose too fight him instead of staying on the outside and playing it safe.

 

The Vitali rematch but he ran away. (old and fat at 37 mind)

 

The Bruno fight was a harder fight for Lewis than Vitali

Lennox was soundly outboxed for 6 rounds by Bruno and he also took some meaty shots.
Even at the end it was Bruno on top and closing in when he was caught by Lewis who turned up the heat and got the finish.

That said I think the Mercer fight was his hardest, while he won comfortably on the cards he was never comfortable during the fight.