US Open day two - listen to live commentary on BBC 5 Sports Extra (UK only)
GB's lucky loser Jacob Fearnley produces superb comeback to beat Martin Landaluce 4-6 6-2 4-6 7-5 6-3
Carlos Alcaraz wins 6-4 6-4 6-4 against Roman Safiullin in first singles match for over four months
Defending champion Alcaraz had not played singles since April after injuring his wrist
British qualifier Harriet Dart beats Peyton Stearns 3-6 6-3 6-2 for first Grand Slam win in over a year
Top seed Aryna Sabalenka battles to 6-2 6-4 win over Camila Osorio in first round of title defence
*Sabalenka 6-2 5-4 Osorio
Aryna Sabalenka gets it as Camila Osorio goes long. That could prove to be the decisive moment in this match as Sabalenka will now try to serve out the match and secure her place in the second round.
*Sabalenka 6-2 5-4 Osorio
Aryna Sabalenka drags Camila Osorio out wide and then slams a backhand winner the other way to bring up a break point. This would be huge for the top seed.
Image source, Getty ImagesSabalenka 6-2 4-4 Osorio*
Aryna Sabalenka gets through that service game, but Camila Osorio makes her work for it.
Osorio could theoretically be out in two games' time, but her team are making up some energy drinks for her. That's belief for you!
*Dart 3-6 6-3 0-1 Stearns
A confidence-boosting hold to 15 for Peyton Stearns to open the deciding set on court 12.
*Sabalenka 6-2 3-4 Osorio
Camila Osorio came close to breaking Aryna Sabalenka's serve the last time around. What can she do here?
The four-time major winner is looking increasingly fed up as she fails to land another first serve and again when Osorio wrongfoots her after coming to the net. 30-30.
*Sabalenka 6-2 3-4 Osorio
Dan Kiernan
Grand Slam doubles coach on BBC Radio 5 Sports Extra 2
Sabalenka is not there yet is she? You can see and feel it. She can't get through - it's tough, it's difficult and she just can't quite get through to what she is used to with her level. But it is six months since we've seen that level.
Image source, Getty Images*Sabalenka 6-2 3-4 Osorio
An eighth double fault by Camila Osorio opens the door for Aryna Sabalenka at 15-30, but the top seed can't react to the body serve on the next point and then she nets.
The Colombian has to crouch down to get her racquet to a searing Sabalenka forehand, but she gets it and the Belarusian finds the fence again.
*Sabalenka 6-2 3-3 Osorio
You can feel Aryna Sabalenka's frustration as she strikes through the ball with some serious power. Absolutely no stopping those and she pulls herself through after saving two break points.
Osorio is pushing the world number one to the limit at the minute.
Dart 3-6 6-3 0-0 Stearns*
Dan Kiernan
Grand Slam doubles coach on BBC Radio 5 Sports Extra 2
Brilliant from Harriet Dart.
The last two points she absolutely earned them. When you're trying to get over the line in a key moment like that, fair play to Stearns who made her work for it but Harriet Dart stepped up.
Dart 3-6 6-3 0-0 Stearns*
Peyton Stearns is left to rue her inconsistency as she's taken to a deciding set by Harriet Dart.
She earns a break point after nailing a pinpoint cross-court backhand pass with Harriet Dart at the net but then sends a loose forehand long. A forehand winner at deuce gives her another chance but she plants a second-serve return into the net.
British qualifier Dart eventually comes through deuce at the fourth attempt, sticking in a baseline exchange and waiting for the error to earn advantage before converting set point with a forehand winner.
She lost her opening service game of the second set but recovered with two breaks of her own to clinch it 6-3.
Image source, Getty Images*Sabalenka 6-2 2-3 Osorio
Another backhand down-the-line winner rescues Aryna Sabalenka. Deuce.
*Sabalenka 6-2 2-3 Osorio
Aryna Sabalenka lashes a backhand winner down the line to save the break point, but Camila Osorio beats her with a sublime cross-court forehand to earn herself another.
*Sabalenka 6-2 2-3 Osorio
Aryna Sabalenka slaps her hand off her thigh as her wide forehand gifts another break point to Camila Osorio.
*Sabalenka 6-2 2-3 Osorio
After slicing into the net, Aryna Sabalenka turns to power on the next point and it pays off as Camila Osorio shanks a return wide.
The Belarusian is left stranded as she makes her way to the net and she can't adjust her feet fast enough to reach a lob attempt by Osorio. 30-30.
*Sabalenka 6-2 2-3 Osorio
Camila Osorio struts back to her chair to a round of applause as she dinks over the deftest of drop shots to bring up the hold.
Sabalenka 6-2 2-2 Osorio*
A groan from the crowd as Camila Osorio, after challenging Aryna Sabalenka with some hefty forehand shots, slams into the net.
The world number 52 is still smiling, though, and she clenches her fist as she lands a cross-court winner to go level at 30-30.
*Dart 3-6 5-3 Stearns
Unforced errors off both wings for Peyton Stearns as she gives up 0-40.
The American earns a point back as Harriet Dart returns long but then slams a cross-court forehand beyond the tramlines to gift the Briton a second break of the set.
Dart will serve to take the match into a decider.
Image source, Getty ImagesSabalenka 6-2 2-2 Osorio*
Camila Osorio is looking more confident, but there's not much she can do to combat a cross-court forehand winner like that from Aryna Sabalanka.
The top seed double faults, pulling Osorio up to 40-30, but the Colombian can't return the next serve and we're back level.
Dart 3-6 4-3 Stearns*
Both players come through holds to 30 to keep the second set on serve.
Harriet Dart closes out her service game with a whipped cross-court forehand which leaves Peyton Stearns flat-footed on the baseline.
*Sabalenka 6-2 1-2 Osorio
Aryna Sabalenka lets out an angry roar and throws her hands up in frustration as she allows Camila Osorio back in at 30-30.
The Belarusian glares at her team as another skewed forehand gifts her opponent the hold. That's just the second time that Osorio has held serve in this match.
