A hero’s journey, ending in a wrenching farewell — sports historians will debate whether Roger Federer was the greatest men’s tennis player of all time, but few will deny that he was among its most dignified. Last month, the 41-year-old, 20-time major champion made official what had felt inevitable for some time: The ravages of age, culminating with a recent knee surgery, finally persuaded him to retire. A hastily arranged final appearance at the Laver Cup in London quickly morphed into a send-off for the Swiss superstar, a Festival of Fed. He teamed up with his friendly rival Rafael Nadal for a doubles match, a contest that felt mostly like an excuse to watch a legend take the court one last time.