Hello and welcome to LIVE coverage from this men's fourth round match at the US Open. It's the final match fom day eight and it's between five-times winner Roger Federer and Austrian Jurgen Melzer

So that's Federer through to the quarter-finals in New York and next up for him will be tricky Swede Robin Soderling, who has been in good form so far at this tournament

WINNER! A forehand right on to the baseline that Melzer can only hit wide off leaves Federer with three match points. But only one is needed as he races up to a shorter ball from from Melzer and whips it down the line for a forehand winner

Melzer threw everything he had at Federer in that game and it paid off as he holds from deuce when the world number two sends a cross court backhand wide into the tramlines. He will serve for the match next though

Maybe not as much of a march as the man himself would like as Federer is forced to save a break point with an ace and escapes a second when Melzer can only return a heavy second serve into the net, and a third when the Austrian again hits into the net, this time off the forehand wing. And Federer goes on to hold eventually when Melzer's forehand return flies long of the baseline. The Austrian will have to serve to stay in this match after the change of ends

BREAK! Ouch. Melzer squanders a game point chance by rushing a backhand approach shot into the net and Federer takes the opportunity to earn himself a break point with a high backhand volley across into the open court. And sure enough, the world number two does break, easily getting up to a backhand drop shot from the Austrian and putting enough on the ball that Melzer cannot get the volley back over the net. Federer is on the march now.

Federer saves two break pionts, both with forehand winners, to level up at deuce only to give Melzer another chance immediately by looping a forehand long of the baseline. Still a forehand long from the Austrian squanders the chance and Federer goes on to hold with an ace - his second of this second and eighth overall

It's business as usual on serve as these two players trade another hold apeice. This is for a place in the quarter-finals where fifth seed Robin Sodering awaits, remember.

BREAK! Melzer wants another ball as one has been lost to the crowd but umpire Kader Nuni says no and the Austrian lets it get to him. Federer squanders a first break point with a forehand long down the line. But he finds a forehand volley right into the corner of the net on the second chance and that's the break back for the world number two

BREAK! Well, well. Melzer is angry. And it's beginning to pay off as he breaks to 15 at the first attempt in this third set, when Federer sends a forehand well into the tramlines across court

SET! One is all that's needed though as he fires a forehand winner across court on the angle before a yell of "come on" rings out over and above the cheers from the crowd. You don't hear Federer as vocal as that very often

As if Federer needs anymore luck! A forehand return of serve from the world number two catches the top of the tape and literally dribbles over the net to leave him two points from the set. And when a Melzer lob drops just long it leaves Federer with two set points ...

Melzer is pretty angry with himself after dumping a forehand return of serve into the bottom of the net that leaves the scores level at 3-3 at the change of ends. Especially after he'd just raced up to a sliced backhand drop shot from Federer and fired it away for a foerhand winner to sneak out in front

Good point rjboon57 - yep, you could find that info about Franco Squillari on the ATP site in seconds. You still took the time to look though and it's nice to know for a fact that there's someone out there on these long night shifts!!

Sure enough it is tie-break time, folks, as Federer posts another comfortable service hold when Melzer's backhand drifts just long of the baseline. So far this year that Austrian is 12-15 on breakers won and lost while Federer has a win-loss ratio of 16-8 on the breakers

A great volley back behind Federer does the damage from Melzer, although Federer gets it back the following volley is then easy for the Austrian, and that helps him level up at 30-30. And Melzer goes on to hold with a dipping backhand across court that Federer can only volley into the net. Anyone for a tie-break? Melzer's done his bit to ensure that's the worst that can happen for him

"Anything you can do ..." Federer posts a love service game of his own, throwing an ace into the mix for fun before levelling up when Melzer sends a forehand return of serve long of the baseline

Melzer leaves himself potentially just one game away from taking the second set and levelling up this clash as he eases through another service hold with a great first serve out wide. He's broken Federer once already in this match, can he do so again after the change of ends and snatch this set?

Federer posts a love service game to level up once again with a big serve and forehand winner - a favoured combo of the world number two. This is a proper old-skool match with the two players making regular forays into the net. Federer, of course, is a great net player and Melzer has won eight doubles titles over the course of his career, including at Wimbledon earlier this summer

Apologies apollovn. You are absolutely right, it was very much not the world number one that hit that shot a couple of games ago. It was, of course, the world number two Federer. Slip of the fingers there. It takes a bit of getting used to, not calling Federer the world number one. Not that Nadal doesn't deserve the position of course.

Melzer is beginning to pick up some momentum here as he holds once again, to 30, when Federer's inside out forehand across court flies long. You still get the feeling, Federer has another couple of levels he can move up through should he need to though