US Open day three
British number one Arthur Fery beaten 6-3 6-3 7-5 on New York debut by 13th seed Lorenzo Musetti
Elena Rybakina beats wildcard Thea Frodin 6-3 6-2, wins for Madison Keys and Mirra Andreeva
Rybakina will replace Aryna Sabalenka as world number one if she reaches semi-finals
Flavio Cobolli comes from behind to beat Francisco Comesana in five sets, Taylor Fritz also through to second round
Comesana 6-3 6-2 3-6 4-6 4-6 Cobolli
Image source, Getty ImagesThe comeback is complete! Flavio Cobolli has done it!
The Italian drops to his knees and laps up the applause from the crowd. That's the first time in his career that he's fought back and won after being two sets down.
You've got to feel for Francisco Comesana, though. The world number 119 put up a hell of a fight.
Comesana 6-3 6-2 3-6 4-6 4-5 Cobolli*
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Live
There's a bit more speed coming from Cobolli on that first serve delivery and that's what is key.
Comesana 6-3 6-2 3-6 4-6 4-5 Cobolli*
The tables can turn so quickly in tennis, and after facing two break back points, Flavio Cobolli finally has a match point.
*Rybakina 5-3 Frodin
Cheers all round as Thea Frodin comes on the approach and buries a cross-court backhand volley for 40-30.
She secures the hold with a rocket of an inside-out forehand and screams a full-blooded "COME ON!".
Comesana 6-3 6-2 3-6 4-6 4-5 Cobolli*
Well, well, well. Francisco Comesana isn't giving up without a fight and he's helped on by a double fault from Flavio Cobolli. The worst of timings for the Italian.
Comesana has got himself two break back points!
Rybakina 5-2 Frodin*
Thea Frodin gives Elena Rybakina a taste of her own medicine - second serve ace down the T. 15-0.
Comesana 6-3 6-2 3-6 4-6 4-5 Cobolli*
Now then, can Flavio Cobolli hold his nerve and complete the comeback?
He flings a forehand long on the first point before Francisco Comesana nets the next one. 15-15.
Comesana 6-3 6-2 3-6 4-6 4-5 Cobolli*
It's long from Francisco Comesana! Is that it for the Argentine?
After four hours, Flavio Cobolli will serve for the match.
Rybakina 5-2 Frodin*
Make that three love holds in a row for Elena Rybakina, who bookends her service game with aces. The second - 103mph down the T - was a second serve.
Image source, Getty Images*Comesana 6-3 6-2 3-6 4-6 4-4 Cobolli
Flavio Cobolli drops to his knees as he blasts a forehand wide. He was on top in that point, but he lets it slip away.
He's got another chance though.
*Comesana 6-3 6-2 3-6 4-6 4-4 Cobolli
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Live
It's the forehand and the footwork that's mesmerising for Comesana - he's trying to find the Cobolli backhand but unable to. There's a bit more liveliness in the legs of the Italian.
*Rybakina 4-2 Frodin
Elena Rybakina capitalises on her first break point, forcing a backhand error from Thea Frodin.
It'll be a tough ask for the American to hit back - Rybakina has held her past two service games to deuce.
Image source, Getty Images*Comesana 6-3 6-2 3-6 4-6 4-4 Cobolli
Flavio Cobolli continues to ramp up the power on his forehand and he's got a really opportunity here at 0-30 on Francisco Comesana's serve.
The Argentine pulls one point back, but then fires long. Two break points for the chance to serve out the match and complete a brilliant comeback.
Rybakina 3-2 Frodin*
Lovely combination from Thea Frodin, stepping into the court after a powerful serve down the T and unleashing a backhand winner with Elena Rybakina flat-footed on the baseline. 30-15.
The pair exchange a dozen or more hefty blows from the baseline before Frodin shanks one wide.
With a forehand into the net cord, the youngster is facing break point.
*Comesana 6-3 6-2 3-6 4-6 4-4 Cobolli
After fighting his way though his own service game, Francisco Comesana can't lay a proper challenge on Flavio Cobolli's.
The Italian seems to have found his range on his forehand and he wraps up that hold with a lethal inside-out one across court.
Rybakina 3-2 Frodin*
Back-to-back holds to love for Elena Rybakina, this one sealed with an ace out wide.
She's only dropped two points across three service games.
Comesana 6-3 6-2 3-6 4-6 4-3 Cobolli*
The level of tennis is going up and up on Louis Armstrong Stadium as we pass the 10-minute mark for this game.
But eventually, after four deuces, Comesana comes through without even having to fend off a break point.
The world number one waves his arms up and down, trying to get the crowd behind him as he head into the business end of this match.
Image source, Getty Images*Rybakina 2-2 Frodin
A first little "come on!" from young Thea Frodin as Elena Rybakina piles a backhand return into the net for 30-15.
Then, a huge "COME ON!" as she seals the game with an ace out wide.
The world number 585 clearly isn't overawed by the occasion.
*Comesana 6-3 6-2 3-6 4-6 3-3 Cobolli
Now it's Francisco Comesana's turn to feel the pressure as he finds himself at 30-all on serve.
Flavio Cobolli attempts to lob the Argentine, but there's not enough height on the ball and Comesana leaps into the air and slams dunks it into the open court.
The fifth seed forces deuce before finding the fence, but he takes us back with the softest of touches on the volley to just lift the ball over the net. The crowd loved that one.
Back and forth we go, with each player cupping their ears and trying to steal the attention of the crowd. Deuce.
Rybakina 2-1 Frodin*
Elena Rybakina's serve is such a weapon. She's hit more than 350 aces this season - no one else on the WTA Tour has passed 300 - and adds another to her account for 15-0.
The one time Thea Frodin gets a decent return into court and manages to extend the rally, she's worn down by Rybakina's thumping power and depth.
