Double switch for the visitors.

Wolves loanne Dexter Lembikisa makes his debut, as does 16-year-old James Wilson, who's had a fine season for Hearts B in the Lowland League.

Kyosuke Tagawa and Yutaro Oda are off.

Oooft. Not far away that.

Craig Halkett flicks on the delivery and it looks destined for the bottom corner, but there's a Spartans body there to get rid.

And the Japanese pops again as he swings his boot at the looped ball into the box.

Deflected behind for the corner.

Yutaro Oda flashes a cross one but there's no one there to take advantage.

Hearts still penning Spartans in without too much cutting edge. We need something to liven this one up.

Jane Lewis
BBC Scotland at Ainslie Park

The crowd could be playing more of a part here. They are right on top of the action, but they’re fairly quiet. Well, apart from the small band of drum players on both sides.

That's a better corner form the visitors.

It's Jorge Grant with the delivery this time, who finds a free Frankie Kent. The defender's header drops just wide.

What do you do when it's a sell out?

Any means necessary for these troops.

Image source, SNS

Image source, SNS

And Carswell is at it again.

Kenneth Vargas dances into the box and gets a fierce strike away. The Spartans keeper equal to it. Cracking save.

Another Alex Cochrane corner comes in - this one collected well by Blair Carswell.

Impressive showing by the Spartans goalkeeper so far.

It's driven in low in the direction of Steven Kingsley, whose effort is blocked in a busy box.

The ball is looping around in the aftermath, but Spartans skipper Kevin Waugh calmly heads it back to his keeper.

First corner of the half incoming as Alex Cochrane sees his delivery deflected behind.

Off we go again in the capital.

Will Spartans spring a surprise in the second period?

Former Scotland rugby captain Gavin Hastings is an interested spectator this afternoon, and has been chatting to BBC Scotland:

"I do have a slight connection with Spartans. My son Adam used to play for one of the junior teams here.

"It's great to see such a full house today. Hearts are my team, so I'm here wearing two hats I suppose.

"It's a wonderful community club, and what Spartans have done in this part of Edinburgh is nothing short of brilliant."

So now that we know Dumbarton v Rangers is on, we're in this for the long haul.

We'll have live text coverage of that one, as well as all the 3pms. Stick with us!

From a Scotland perspective, it really is class to see Craig Gordon back.

He's not had too much to do, but that save from Callum Booth's volley was a sign he's still got it. You'd imagine Steve Clarke is watching on.

Image source, SNS

Shelley Kerr
Former Scotland head coach on BBC One Scotland

Hearts started really well, used wide areas particularly well, and that was how they got the goal.

Spartans have been organised and made it really compact. It's been difficult for Hearts to find space.

Kenneth Vargas' fine header is the difference at the break.

Not much to get excited about so far, but Spartans are certainly still in this one. Big team talk from Dougie Samuel to come.

Image source, SNS

Leanne Crichton
Former Scotland international on BBC Scotland

Carswell does really well. It's a brilliant stop from the goalkeeper.

The quality of the finish isn't there from Vargas. He needs to do better I think. He gives the goalkeeper a chance.

Dumbarton's Scottish Cup tie against Rangers goes ahead after the League 2's pitch passed an inspection.

The fourth-round contest will kick off at 17:30 GMT.