Rafael Nadal survived an epic 28-minute tiebreak to seal his spot in the quarterfinals of the Australian Open and top seed Ashleigh Barty joined him with victory over giant-killer Amanda Anisimova on Sunday. Nadal will now face Canada’s 14th seed Denis Shapovalov after he stunned third seed and Olympic champion Alexander Zverev – who said “everything” went wrong. Nadal, who is chasing a men’s record 21st Grand Slam title, was pushed all the way by Adrian Mannarino in an 81-minute first set before breaking the Frenchman’s resolve in a 7-6 (16/14), 6-2, 6-2 victory. Meanwhile, world No 1 Barty t…