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.