Novak Djokovic continues his quest for tennis history on Saturday night as he takes on Jenson Brooksby for a place in the US Open quarter-finals.
Djokovic has already won the Australian Open, French Open and Wimbledon this year, meaning another title in New York will give him the first men's calendar slam in more than 50 years as well as ensuring he has won more Majors than anyone else.
His fourth-round opponent is Jenson Brooksby - a young American who is impressing many.
Djokovic is, of course, an overwhelming favourite to win the match, but there should also be plenty to keep sports gamblers interested too.
Djokovic vs Brooksby head-to-head
Unsurprisingly, this is the first time the players have met.
Brooksby only turned pro this year and so he is still reliant on wild cards.
That might help, though. The American is very unconventional in terms of his style of tennis, so he could catch Djokovic unawares early on.
Novak Djokovic in focus
World ranking: 1
Height: 6ft 2in
Turned pro: 2003
Career W/L: 972/197
US Open so far: R1: Holger Rune 6-1, 6-7, 6-2, 6-1
R2: Tallon Griekspoor 6-2, 6-3, 6-2
R3: Kei Nishikori 6-7, 6-3, 6-3, 6-2
Djokovic has been quite significantly short of his best in the tournament, although his 50% is still better than most players' 100%, so he has not had any real scares.
There has been some uncharacteristic sloppiness in the Serbian's game, and you'd not have expected him to have dropped two sets in the opening two rounds of a tournament such as this.
For context, rivals Daniil Medvedev and Alexander Zverev have both dropped fewer sets heading into the fourth round so it's clear Djokovic is not firing on all cylinders yet.
That said, Djokovic knows better than anyone that you don't win Majors in the first week of a Grand Slam, it's the second that counts, and there is little to suggest he is seriously out of sorts.
Jenson Brooksby in focus
World ranking: 99
Height: 6ft 4in
Turned pro: 2021
Career W/L: 8/4
US Open so far: R1: Mikael Ymer 7-5, 6-2, 5-7, 6-3
R2: Taylor Fritz: 6-7, 7-6, 7-5, 6-2
R3: Aslan Karatsev: 6-2, 3-6, 2-6, 6-3, 3-6, 3
If Brooksby is a new name for you, then don't feel bad. He is a new name to even the most ardent of tennis fans.
The American has burst onto the scene somewhat at the US Open, where he has actually registered some very impressive wins.
He rolled over compatriot Taylor Fritz in round two, while Aslan Karatsev has a Grand Slam semi-final under his belt this season.
Even more impressive was Brooksby's form in Washington last month. Jannik Sinner eventually ended his run in the semi-finals, but not before Brooksby had put out former two-time Grand Slam finalist Kevin Anderson, Frances Tiafoe, Felix Auger-Aliassime and John Millman. Had Djokovic himself negotiated that path to a semi-final, he'd likely consider it a job well done.
Best bets for Djokovic vs Brooskby
Novak Djokovic to win 3-1
Ordinarily, you'd expect Djokovic to completely overpower a player of Brooksby's ranking without breaking much of a sweat.
Actually, you'd expect Djokovic to completely overpower a player 70 places above Brooksby in the rankings without much sweat.
This one may be a tricky one for the world No. 1, though. He could take a little time to fully get to grips with Brooksby's style and the fans on Arthur Ashe will be firmly in the American's favour.
There is every chance Brooksby wins a set against Djokovic, but if he does he's only winning one.
Novak Djokovic to win the first set 7-5
With Djokovic needing a little time to feel out Brooksby's game and the American buoyed by a partisan home crowd, the first set may well be a very tight affair.
When Djokovic wins the toss he tends to serve first, and should that happen then Brooksby may well be able to stay with him until the end.
However, as the pressure ramps up, no one would be surprised to see Djokovic pinch the set at the death.
Jenson Brooksby to win the second set
Djokovic's main problem at the US Open has been uncharacteristic lapses in concentration. That is what happened in his first-round match against 18-year-old Holger Rune, who was able to take advantage and win the second set.
Should the crowd on Arthur Ashe get encouragement from Brooksby, it could prove a distraction for Djokovic who has been known to react badly, albeit momentarily, to a crowd fervently in his opponent's favour.
That could open the door for Brooksby to win the second set, although he will need some luck with the timing because such lapses from Djokovic do not last long.