Fenners:, external Today's Gold Cup selections: Bobs Worth to win, Giant Bolster each way; Teaforthree best of the outsiders. You heard it here first!

Cheltenian will hope to become a multiple winner at the Festival after winning the Weatherbys Champion Bumper at the Festival in 2011. Flaxen Fare and Cinders and Ashes have also won at Prestbury Park in the past.

Our next race is at 14:05, the Vincent O'Brien County Handicap Hurdle. Favourite Cheltenian has been heavily backed throughout the day for this 28-horse race.

Ruby Walsh was due to be on Arctic Fire, but it's just been confirmed he will not ride again today after suffering a heavy fall in the opening race of the day. He's gone straight to hospital where doctors will assess a possible arm fracture. David Casey will now ride Arctic Fire, meaning Danny Mullins will race Diakali.

Image source, PA

BBC Radio 5 live

Tiger Roll's jockey Davy Russell after he won the JCB Triumph Hurdle: "Your season revolves around these four days. Last night I didn't think my season would end the way it would. Hopefully Ruby is OK, fingers crossed for him."

Derek Thompson
BBC Radio 5 live reporter at Cheltenham

"There is an unconfirmed report that Ruby has broken his arm. He was holding the lower part of his right arm. We hope he is OK."

Ruby Walsh is down to ride On His Own in the Gold Cup at 15:20. It appears that is now in doubt.

Derek Thompson
BBC Radio 5 live reporter at Cheltenham

"Ruby has walked into an ambulance. It looked like a bone-crunching fall. Will he be able to ride again? He has some big rides today."

Andrew Thornton
Jump jockey on BBC Radio 5 live at Cheltenham

"Ruby's got thrown to the ground and I fear another horse has stood clean on his forearm. He's got his right arm to hold up his left arm. He knows his Cheltenham is over."

Top jockey Ruby Walsh appears to have been injured after falling off Abbyssial early on in that first race.

1. Tiger Roll (D N Russell) 10-1

2. Kentucky Hyden (D Bass) 20-1

3. Guitar Pete (P Carberry) 7-1

4. Calipto

And Tiger Roll charges through on the outside to win the opening race of Gold Cup Day.

Plinth is being overtaken as Broughton begins to make a move. Guitar Pete and Tiger Roll are piling forward too.

Two to jump and Plinth is racing ahead. But does he have the stamina?

Royal Irish Hussar is keeping a distance out wide, but is travelling well towards the front.

This is a very fast race for young horses and Abbyssial, the early leader, falls.

It looks like Zara Phillips is giving television presenter Kirsty Gallacher a tip ahead of the first race of the day, the Triumph Hurdle, which is now under way.

Image source, Reuters

Frank Keogh
BBC Sport at Cheltenham

Runners going down to the start at Cheltenham for Triumph Hurdle on Cheltenham Gold Cup day:

Cornelius Lysaght
BBC horse racing correspondent at Cheltenham

Achtung (1-30) intended jockey Chris Timmons stood down after failing r/c breathalyser; replaced Peter Buchanan.

BBC Radio 5 live

A quick reminder that BBC Radio 5 live are live from the track this afternoon. Join presenter John Inverdale and the team throughout the afternoon on the radio or online. If you've never listened to horse racing on the radio before, you are missing out. Give it a go.

Anybody looking to land a big one today? If so, Cherry Tiger is 750-1 with some bookmakers ahead of the JCB Triumph Hurdle. His best finish is third at Yarmouth, but you never know. Stranger things have happened. I think.