US Open LIVE updates: Popyrin drops first two sets to home ...

Popyrin displays great sportsmanship to applaud his good friend’s final winner of the night and embraces him at the net after a high-quality four-set slugfest, but that was a pretty devastating defeat.

Frances Tiafoe beats Alexei Popyrin.Credit: Getty Images

Double faults mortally wounded him in crucial moments of the second and fourth sets, but that mid-court forehand miss on break point in the final game was the costliest of all.

Popyrin has arrived as a force, but you never know when these opportunities will arise again. Tiafoe advances to a quarter-final against Bulgarian star Grigor Dimitrov.

Thanks for joining us on the live blog for day seven of the US Open.

We’ll see you again tomorrow for the all-Australian fourth round match between Alex de Minaur and Jordan Thompson. That’s set for 7.00am AEST so make sure to set your alarms and make an extra large cup of coffee.

Goodbye for now!

And there it is.

American Frances Tiafoe has beaten Aussie Alexei Popyrin in four sets 6-4, 7-6 (6-3), 2-6, 6-3.

Still a tournament to be hugely proud of for Popyrin, who soared to new heights in this grand slam.

Taifoe will next meet big-serving Bulgarian Grigor Dimitrov in the quarter-finals.

Frances Tiafoe of the United States.Credit: Getty Images

American Frances Tiafoe, with the home crowd behind him, is just one game away from stealing the victory. But, it’s tennis, anything can happen.

Alexei Popyrin is now serving to stay in the tournament.

Tiafoe leads 6-4, 7-6 (7-3), 2-6, 5-2

Frances Tiafoe, of the United States, reacts against Alexei Popyrin.Credit: AP

But only just. The American Tiafoe leads Aussie Popyrin 3-2 on serve in the fourth set.

If he wins this set, match over. If not, we’ll head to a fifth.

Tiafoe leads 6-4, 7-6 (7-3), 2-6, 3-2

Alexei Popyrin, of Australia, reacts against Frances Tiafoe, of the United States.Credit: AP

Although there’s a lot more at stake here, let’s talk money.

In Australian terms, the result of this fourth round match at the US Open is worth about $300,000 to the winner.

By making the round of 16, both players are guaranteed $US325,000 ($479,000), but the winner will pocket at least $US530,000 ($782,000) by making the quarter-finals.

Beyond that, the big money really starts to roll in. A semi-final berth is worth $US1 million ($1.48 million), while the tournament’s runner-up collects $US1.8 million ($2.66 million) and the winner walks away with $US3.6 million ($5.3 million).

The prize money matrix is the same for the women’s draw.

Taifoe leads 6-4, 7-6 (7-3), 2-6