De Minaur goes down swinging in midnight slugfest against Cilic

Teenager Alex de Minaur was up two sets to love before losing a five-set marathon to Marin Cilic in New York

GETTY IMAGES Teenager Alex de Minaur was up two sets to love before losing a five-set marathon to Marin Cilic in New York

MATCH POINT: The US Open is Cilic's most successful Grand Slam, with a 32-8 (80 percent) record after tonight.

Former champion Marin Cilic withstood a tremendous challenge from Australian teenager Alex De Minaur to reach the fourth round of the US Open in one of the latest finishes in the tournament's history.

Refusing to yield, de Minaur heroically saved five match points in a brutal eighth game of the fifth set to make Cilic serve it out at 5-3.

Kyrgios freely admits to lacking concentration at times; De Minaur, however, rarely lets a game - let alone a set - go by with a lapse in focus.

Like two prize fighters, Cilic and de Minaur traded savage blows for four hours in a baseline slugfest that started just before 10.30 on Saturday night and finished at 2.22 on Sunday morning.

Croatia's Marin Čilić has fought back from two sets down to advance through to the fourth round at the US Open in NY. "I was just a little bit luckier today".

After saving a number of match points on Čilić's serve at 5-3, de Minaur would get the break to get back into the set. De Minaur, however, did not surrender, putting pressure on Marin who was serving for the match at 5-3.

Cilic, the 2014 champion, may have been justified in expecting an easier pathway past the third round, but the 19-year-old De Minaur has already earned a reputation for having an abundance of fighting spirit in his relatively short career. But finally, on his eighth match point, Cilic hit a crosscourt forehand victor to seal a Round of 16 date vs. David Goffin. What a comeback he made at 5-2.

As for de Minaur's state of mind afterward?

Del Potro outlasts Isner in quarters
Prosecutors reject abuse cases involving Kevin Spacey, Steven Seagal