It's a big moment for Nigerian tennis as 17-year-old Oluwaseun Ogunsakin has just landed his first ever Grand Slam main-draw win at the US Open Junior Tennis Championships in New York. This isn't just any win; he came from a set down to defeat the 15th seed, Kuan-Shou Chen from Chinese Taipei, with a final score of 5-7, 6-3, 7-5.

This victory is a huge milestone for Ogunsakin, who plays out of the Aurum Tennis Academy. Before this, he hadn't managed to win a match in the main draw of any junior Grand Slam. It's the kind of breakthrough players dream of, especially after battling through a tough qualifying round.

To even get to the main draw, Ogunsakin had to play his heart out. He first took down Poland's Tymon Litwic 6-3, 6-0. Then, in what you'd call a proper upset, he beat the tournament's top seed, Felix Roussel of Canada, with a solid 6-3, 6-4 victory. Earning a spot in the 64-player main draw isn't a small feat. He's clearly just getting started.

His latest match against Chen was a real nail-biter. Going the full three sets meant he had to dig deep and keep his cool when it mattered most, especially in those crucial final moments of the deciding set. It shows a lot of mental strength for someone so young.

This breakthrough at the US Open is part of a rapid ascent for the young Nigerian. He's only in his third Grand Slam junior tournament and has already shown significant progress. His Grand Slam journey began at the Roland Garros Junior Championships where he made it to the second round of qualifying. He then managed to get into the main draw at Wimbledon.

At Wimbledon, Ogunsakin also showed his prowess in doubles, reaching the semi-finals of the boys' doubles competition alongside his partner. This success in doubles further solidifies his growing presence and reputation on the international junior tennis scene.

With this win at the US Open, he's now appeared in the main draw at two major tournaments – Wimbledon and the US Open. He also has a main-draw appearance at Roland Garros to his name, making him a consistent contender on the junior circuit.

Ogunsakin's next challenge in the US Open Junior Championships will be against South Africa's Connor Doig in the second round. The draw isn't getting any easier, but he's shown he has what it takes.

Adding to the Nigerian presence in the doubles draw, Ogunsakin will also team up with Ntungamili Raguin, a talented young tennis player from Botswana who has already made history in his own right. It'll be interesting to see how this partnership fares as the tournament progresses.