Froch was a very limited fighter, but had a granite chin and an outstanding attitude and work ethic. He was also involved in some entertaining fights. That's how I will remember him.
Got lucky a few times in his career and was completely outclassed by the only really elite fighter he ever fought who was at the top of his game.
Groves fought Froch towards the end of his career when there weren't really many meaningful fights out here for him. Sure, he dropped Froch and gave him all kinds of trouble in the first fight, but then he ran out of gas and totally choked in the rematch. It's not really a fight that defines Froch's career, but it does reiterate what we already knew: Froch wasn't pretty, but he came to fight and, most of the time, he found a way to win. How does he compare to the all time great middleweights? To be honest, he doesn't really compare at all, but he did unbelievably well for a guy with such limited skills.
As for Groves, well, he's an OK fighter and the first Froch fight was a classic, but he won't live long in the memory.
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