Postpublished at 18:01 British Summer Time 18 September 2016
*Evans 6-4 3-6 2-6 0-0 Mayer
Miles Maclagan
Former British Davis Cup player on Radio 5 live sports extra
Both players know it, this is an absolutely vital stage of this match.
Davis Cup semi-final result: GB 2-3 Argentina
Croatia v Argentina in final, GB title defence ends
Andy Murray (GB) beats Guido Pella (Arg) 6-3 6-2 6-3
Leonardo Mayer (Arg) beats Dan Evans (GB) 4-6 6-3 6-2 6-4
Mike Henson
*Evans 6-4 3-6 2-6 0-0 Mayer
Miles Maclagan
Former British Davis Cup player on Radio 5 live sports extra
Both players know it, this is an absolutely vital stage of this match.
*Evans 6-4 3-6 2-6 0-0 Mayer
Leonardo Mayer lashes a forehand just long with a healthy slice of court to aim at and Evans out of the picture to squander a second break point.
That was a big miss.
Dan Evans is knocked back from game point with a forehand slid out wide.
On we go...
*Evans 6-4 3-6 2-6 0-0 Mayer
A couple of errors off Leonardo Mayer's racquet raise British fans' hopes. Has the Argentine run cold?
But Dan Evans follows with a couple of mistakes of his own. 30-30.
A crunching forehand across court from Mayer brings up 30-40 and sets the alarm bells ringing.
Evans plucks an ace out of the quiver just when he needs it.
Deuce.
*Evans 6-4 3-6 2-6 0-0 Mayer
John Lloyd
Former GB Davis Cup captain on BBC Two
You have to give immense credit to Mayer. His game has elevated and this is the deciding rubber in a semi final of the Davis Cup.
He is playing like a man possessed. There is not a lot Dan Evans can do.
At the moment he is not sure what to do. There are times you have got to guts it out, change it up with variety, and know at sometime Mayer will miss.
*Evans 6-4 3-6 2-6 Mayer
Dan Evans is staring into his demons now.
He has run into a whirlwind in the shape of Leonardo Mayer's red-hot form.
He came into the match with better form and a higher ranking.
Can his belief survive this onslaught?
He has headed behind the scenes to try and recover his senses.
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Evans 6-4 3-6 2-5 Mayer*
Leonardo Mayer cracks a couple of groundstrokes long.
Dan Evans has a game on the board.
The Thunderbirds would struggle to rescue this set now though.
Mayer serves for it next.
*Evans 6-4 3-6 1-5 Mayer
John Lloyd
Former GB Davis Cup captain on BBC One
This is going away far too quickly now.
*Evans 6-4 3-6 1-5 Mayer
Leonardo Mayer whisks through a hold to love faster than the Tokyo-Kyoto express.
This set is a done deal.
Evans 6-4 3-6 1-4 Mayer*
John Lloyd
Former GB Davis Cup captain on BBC One
Evans needs Leon Smith more than anyone. He needs the calming presence.
Evans is forcing issue too much now. There is a slight bit of panic in his game, trying for quick points because he is being forced back by the brilliant play of Mayer.
He has got to get back to what makes Dan Evans the player he is, the variety.
Evans 6-4 3-6 1-4 *Mayer
This set has been whipped from underneath Dan Evans like a tablecloth in a magician's trick.
He plants a backhand into the midpoint of the net and finds himself a double break down.
Unsurprisingly Leonardo Mayer is trending back in Argentina.
Is it too late to get Juan Martin del Potro back in please?
*Evans 6-4 3-6 1-3 Mayer
Leonardo Mayer swats a streak of a return past Dan Evans for 30-40 and break point.
Evans flopped in the midriff as that went by. This unrelenting quality from the other end could get a man down.
Mayer goes for broke again on the next point, but for once his radar is wonky. Long and to deuce.
*Evans 6-4 3-6 1-3 Mayer
Nice play from Dan Evans as he trains a couple of groundstrokes to the margins and Leonardo Mayer, on the run, punts wide for 40-30.
But the flow of free points off the Mayer first serve continues and is tipping the scales in his favour.
A corker out wide shuts the door on the Briton.
Mayer has won 82% of points behind his first serve so far in the match.
Evans 6-4 3-6 1-2 Mayer*
John Lloyd
Former GB Davis Cup captain on BBC One
At the moment Evans is getting overpowered. The serve from Mayer has been a different level and the groundstrokes are heavier and he's cut down the errors.
I just wonder whether Evans should implement more slice, particularly on the backhand, and change the rhythm. When they are going toe to toe, Mayer is coming out on top.
Evans 6-4 3-6 1-2 *Mayer
Dan Evans gets on the board in the third set, holding to 15.
That looked a little sharper and a little more precise from the Briton.
Mayer's only point was rather fortunate as he planted his feet and Evans' smash came straight to him.
*Evans 6-4 3-6 0-2 Mayer
Leonardo Mayer - Samurai-style headband wrapped around his temple - is still the fastest serve in town.
It is like he has borrowed Juan Martin del Potro's tee-off for the match given the man himself cannot play in this one.
Evans 6-4 3-6 0-1 Mayer*
John Lloyd
Former GB Davis Cup captain on BBC One
Dan Evans again didn't do a lot wrong to lose that.
Sometimes you just have to say too good.
Evans 6-4 3-6 0-1 *Mayer
A vicious second-serve return speeds away for a winner.
The Argentina crowd are chanting and bouncing.
The home fans have dropped their decibels.
*Evans 6-4 3-6 0-0 Mayer
Dan Evans with the most delicate, deftest little half-volley pick-up pulls back to 15-15.
Captain Leon Smith nods knowingly, eyes locked on his man.
A kicker of a forehand winner helps him to 40-15.
Evans bellows a 'C'mon'.
Mayer comes in a feel-volleys his way to deuce.
"Vamos!" comes the response from the Argentina bench.
This is the heart of the match.
Evans 6-4 3-6 Mayer
Miles Maclagan
Former British Davis Cup player on Radio 5 live sports extra
Evans is livid with himself for that 30-30 point. He had the chance but just snatched at it.
That fightback was led by the quality of serving from Mayer. He didn't allow Evans to get into the points.