Katie Boulter v Aliaksandra Sasnovich LIVE: US Open tennis scores as Dan Evans plays Karen Khachanov

Sasnovich makes Boutler work as she’s forced to both sides of the baseline. Boutler defends strongly and gets her reward as Sasnovich ploughs a forehand into the net.

The Brit edges into a 30-15 lead and attempts to come down the line but hits the tape to allow her back into the game.

The players trade blows, and points, to take this game to deuce and Boulter is under threat a bit here. Her first serve percentage is dropping leaving easier opportunities for Sasnovich to attack her serve.

The Belarussian is first to advantage and breaks! Boulter hooks a backhand wide of the court and Sasnovich edges closer to winning the first set.

Sasnovich errs with a double fault at advantage then is bullied by the Boulter forehand. The Brit smokes a winner past her opponent to set up a second break point but Sasnovich saves it again.

This is the longest game of the set and the Belarussian doesn’t want to give it up. She serves to the side line of the box and lands the first ace of the match.

Sasnovich then gets a backhand down the line to drop and manages to hold her serve.

This is a good match. Sasnovich is growing in confidence, Boulter is already confident. There are some great shots coming out and some typical errors

Boulter opens up a 0-30 lead against the serve but punts a backhand into the net. Sasnovich levels the game in the next rally before underhitting a backhand attempt to go down the line and finding the tape.

She needs to defend break point now…

… and does! Boutler runs around the ball to unleash on a forehand but it’s not on. She has to run to far and isn’t balanced as she takes the shot. The ball lands in the net and the game goes to deuce.

Sasnovich stays in the rally but she’s worked side-to-side by Boulter. The Brit then whips a low backhand across court and puts it out of reach of her opponent.

Next up Boulter finds the baseline with a forehand return and forces Sasnovich into the net, she adds a third point too and is flying from her own serve. 40-0.

Aliaksandra Sasnovich has a unique serve. She sets herself with the racket above her head and has a short jab at the ball as it drops back down.

She takes the first two points in this fourth game and forces an error from an attempted backhad return. Boulter hits it too long and Sasnovich moves 40-0 up.

Boulter’s little dip ends with a great shot, a forehand to the back corner, and she stops the run of Sasnovich taking the points. It doesn’t last long though as Boulter nails another forehand too long and Sasnovich holds serve.

Break! Sasnovich breaks straight back to keep this match on serving terms. She had two attempts at clinching then break and took the second one.

Boulter needs to rethink her serve. Sasnovich looks comfortable on it.

Oh nice! Sasnovich slices a return of serve just over the net but Boulter sprints up the court and manages to flick back a cross-court return. Her opponent scrambles across but can only lift the ball out of play.

Great speed and skill from Boulter.

Sasnovich is growing into this match though. She wins back-to-back points, one with a nice forehand winner, but Boulter’s response is a pinging first serve to bring the game level at 30-30.

Lovely! Sasnovich unleashes on a return of serve and fizzes a forehand across the court and into the far corner. It’s not a break point for the Belarussian but Boulter finds a tight angle from the next serve and takes the game to deuce.

Sasnovich has reached the third round of the US Open on a couple of occasions so is used to this court and surroundings. There’s a steely focus to her as she gets her first service game underway.

Boulter takes the first point then smokes a powerful backhand down the line for a winner to move 0-30 ahead. That was a superb shot.

And again! This time it’s a strong forehand after a defence stroke from Sasnovich bounces high into the air. Boulter drills it back and sets up three break points.

Sasnovich saves the first one but then clinches the early break!

Here we go then. Day 2 of the US Open is about to start and Katie Boulter has the first serve against Aliaksandra Sasnovich.

The first rally develops easily enought and the Brit comes forward to the net, Sasnovich nails a passing backhand but sends it too long and the first point goes to Boulter.

Boulter wins the next couple of points too but a powerful forehand from Sasnovich beats her and the Belarussian has her first point on the board. 40-15.

Boulter then holds serve. She’s up-and-running against the qualifier.

Katie Boulter spoke to Sky Sports about returning to New York for the US Open and how it feels to play in this tournament. She said: “There’s so much going on the whole time so you kind of can’t rest.

“So you get excited yourself and it brings that adrenaline. Yeah, I love coming to New York. It’s kind of hard not to. We play to be in atmosphere, right? So this is one of the best for that.

“I think you’re always going to be a little more anxious because it’s a slam. You know it means so much more. Naturally, you do feel a little bit of anxiety, but you turn that straight into excitement and happiness to get out there.”