I would not classify this as reverse racism.
Just because someone is the "first" to do something who happens not to be a white American does not mean there is discrimination or reverse racism. I'm sure the first woman to accomplish something was special because she was the first woman. There is significance in that just as there is significance with what the Williams Sisters accomplished.
I think the idea of reverse racism or discrimination only comes into play by people who feel that when they are born a spot at Harvard or a spot on the tour or a spot wherever is reserved for them simply because of their own race. When someone else who is different comes up and accomplishes what they wish for and think is only for people like them, they cry of reverse this and reverse that to invalidate and lower the accomplishment of that other someone.