The Canadian gets on the board with a punchy down-the-T serve. 15-30, Nadal with a mini-break... quickly put out by a lovely Shapovalov drop shot. Deft.

Denis Shapovalov, baseball cap donned backwards like Mighty Max, frames a backhand into the sky and then moans at the umpire - it's because of a supporter with the flash on her phone, she takes an age to realise as the boos close in on her.

Rafa will not be rushed, but he strolls to a 40-0 lead with some wrist-wrecking serves and then Denis Shapovalov prods long as the Spaniard holds to love.

Image source, Reuters

Here we go.

Rafael Nadal to serve first for Spain.

Spain are well represented in the footballer stakes in Madrid. Ramos, Pique etc... no sign of Paul Peschisolido supporting Canada yet, mind.

Sergio Ramos is in the building! Bet the Spain and Real Madrid can rifle down a serve...

Rafael Nadal and Denis Shapovalov are out warming up. Can the 20-year-old Canadian keep his country's hopes alive against the world number one?

Image source, EPA

We'll take a short break and be back with you for the second singles rubber soon...

And here is Roberto Bautista Agut, speaking to Eurosport: "It was very special feeling on the court and I just could go out and try my best, give my best. I am very happy I could win the first point for Spain."

That really is remarkable from Roberto Bautista Agut, whose father passed away earlier this week. He is understandably emotional in his post-match interview.

He's just put Spain 1-0 up in the Davis Cup final in Madrid.

Felix Auger-Aliassime thunders a backhand long.

Roberto Bautista Agut and Spain have three match points.

A couple of snappy serves take the Spaniard to 30-0.

He's hanging in there... the Canadian teenager saunters into the net to poke a Roberto Bautista Agut forehand back beyond the Spaniard. Felix Auger-Aliassime finally gets the hold and will force the home player to serve for the opening match in this Davis Cup final.

Roberto Bautista Agut goes scuttles along the baseline but can only coax his forehand long.

Felix Auger-Aliassime responds by tugging a forehand towards the sponsor car that's suspended in one corner of the arena... deuce.

Meaty serve. Followed by a double fault... that sums up the Canadian's evening.

Felix Auger-Aliassime then punts a backhand wide and that's deuce.

Felix Auger-Aliassime digs in and slings a forehand winner right on to the tramline.

30-15.

Big hold from the Spaniard. Roberto Bautista Agut edges to within one game of handing Spain a 1-0 lead in the Davis Cup final.

Delightful backhand from the teenager, that barely crept off the surface. Felix Auger-Aliassime needs to fight his way back into this immediately.

But Roberto Bautista Agut is keen to extinguish Canadian hopes. He scrambles to 30-15, before FAA takes control of a lengthy exchange.

Gigi Salmon
BBC Radio 5 Live Sports Extra at Caja Magica

A mixture of adrenaline and emotion is getting Bautista Agut through.