Louth make another change as Tommy Durnin replaces James Maguire with the Wee County searching for a way back into the contest.

Louth survive two Mouth chances in quick succession.

First, Tommy Conroy is brilliantly denied, before Ryan O'Donoghue also sees a goal bound effort kept out.

Advantage is played, though, and O'Donoghue settles for the point to stretch Mayo's lead to nine after 45 minutes.

Mayo work the ball patiently under pressure on the right before switching play to Kobe McDonald in acres of space on the left.

He makes no mistake, curling over to extend the Westerners’ lead.

Jordan Flynn is everywhere at the minute.

He produces a superb tackle to knock the ball from James Maguire's grasp before bursting forward to win a free for Mayo.

Andy Moran then turns to his bench as Conor Loftus, originally named to start, replaces Stephen Coen.

Mayo keep their move alive brilliantly before David McBrien slips a pass to Kobe McDonald on the left.

One quick turn creates the space, and McDonald calmly splits the posts.

The Westerners' lead is out to seven points.

Louth make their second change of the evening as Ciarán Byrne replaces Ciarán Keenan after 40 minutes.

Dara McDonnell looks to have replied with a two-pointer from the left, but Hawk-Eye rules it wide.

Louth remain six points behind.

After a quiet spell, Mayo strike first in the second half.

Jordan Flynn steps out beyond the arc and drills over a superb two-pointer to stretch the lead.

The Westerners are six points clear after 38 minutes.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

If you have a player like Ryan O'Donoghue inside your 21, you have to lock horns, stop his run and make him feel like he is stuck in the mud.

However, he had so much space in the first 20 minutes.

Conroy almost makes an instant impact.

He bursts down the right, skips past two defenders and unleashes a fierce effort that crashes back off the crossbar.

A huge let-off for Louth at the start of the second half.

We're back in action at Croke Park for the final 35 minutes of this All-Ireland semi-final, with Mayo holding a four-point lead over Louth.

Mayo makes a change at the break as Tommy Conroy comes on.

Image source, Getty Images

David Mohan
BBC Sport NI at Croke Park

A little bit of fortune for Mayo's second goal but fortune favoured Darragh Beirne whose instinct was to follow in when his initial shot was blocked and he was rewarded with the goal.

That Louth free just prior to the break: should thy just have taken the point and got in a goal down? Going for two brings its merits, but just to answer back to the goal may have been wise.

Either way, the second half is nicely set up.

Darragh Beirne in the right place at the right time to slot home a second goal for Mayo.

The second half is approaching now but what do you think we will see in the second half?

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Killian Young
Former Kerry player on BBC Sport NI

That Mayo inside line are absolutely devastating.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

Louth are close at half-time, yet they have wasted a lot with shots dropping short and turnovers.

Mayo have done really well at attacking Louth on the flanks.

Louth responded well throughout an entertaining first half, with momentum swinging both ways before Darragh Beirne's late score handed Mayo a valuable cushion.

But after Wicklow's remarkable 12-point comeback in the Tailteann Cup final earlier today, a four-point deficit is unlikely to worry the Wee County too much with another 35 minutes still to go.

All to play for in Croke Park.

Mayo head into the interval with a four-point advantage after a strong finish to the opening half.

Louth search for a late score before half-time, but Sam Mulroy's two-point free effort from beyond the arc drifts wide as the hooter sounds.

Mayo strike again! Sam Callinan reacts quickest after the ball drops in the square and slips a clever pass to Darragh Beirne, who makes no mistake from close range.

Louth are caught out defensively, and it's a huge score with just two minutes of normal time remaining in the first half.