Still work to do, says Azarenka

Victoria Azarenka insists she can topple Serena Williams from her perch despite slumping to an eighth defeat in eight Grand Slam meetings against the 17-time major champion.

For the second year in succession, the 24-year-old world No 2 came up short in the US Open final against the veteran American, losing another three-setter in the longest women's final in more than 30 years.

The defeat took her career record against the world No 1 to 3-13.