In this task you will be given a claim and a perspective. You should determine whether that perspective supports or undermines the claim. If the perspective could possibly convince someone with different view, it is supporting, otherwise it is undermining.

claim: Roger Federer Is Not the Greatest Tennis Player of All Time.
 perspective: He has a losing record against Rafael Nadal. How can you be the best of all time if you're not even the best of your own era?
support