Serena in a class of her own

Champion claims she is at peak of her powers after collecting 17th major title

Serena Williams is enjoying the moment rather than chasing history, but winning a fifth US Open on Sunday - just 18 days before turning 32 has given her some age-defying and record-rivaling Grand Slam ideas.

World No 1 Williams defeated second-ranked Victoria Azarenka of Belarus 7-5, 6-7 (6), 6-1 to defend her title and win her 17th career Grand Slam crown, as many as men's record-holder Roger Federer has collected.