The win over former world number one ` ` King of Clay '' Rafael Nadal records his first win at the Australian Open . Nadal 's win widely regarded as one of the biggest upsets in Grand Slam history . Q : Tell us what match is your biggest tennis upset of all time .
` ` King of Clay '' Rafael Nadal records his first win at the Australian Open . Nadal 's win widely regarded as one of the biggest upsets in Grand Slam history . Q : Tell us what match is your biggest tennis upset of all time .