Sydney: Roger Federer booked his place in the Australian Open semi-finals on Tuesday.
The third seed erased seven match points to complete a stunning 6-3, 2-6, 2-6, 7-6(8), 6-3 win over Tennys Sandgren in an instant classic.
Federer then suffered an injury in the third set after falling behind to an early break.
And the injury clearly impacted Federer’s performance as his body language was subdued when he returned to Rod Laver Arena after a nine-minute break.
But Federer has proved over the years that he can never be ruled out and he saved three match points as they headed for a tiebreak.
Sandgren raced into a 6-3 lead but squandered a further four match points as Federer clung on to take the match to a decider.
And that is when the 20-time Grand Slam winner really clicked into gear as he ground out another impressive last-ditch win.
Federer remains unbeaten (15-0) in quarter-finals at this event. Next up for him is second-seeded Serbian Novak Djokovic or No. 32 seed Milos Raonic of Canada. Federer trails Djokovic 23-26 in their rivalry and has lost their past three matches in Melbourne, all of which took place in the semi-finals (2008, 2011, 2016). The Swiss leads Raonic 11-3 in their series and won their lone clash at this event in 2013.