Medinas wore down Peckhamecho on the run-in to land the spoils in the William Hill Welsh Champion Hurdle at Ffos Las.
The complexion of this competitive race changed in the straight with several horses holding chances including Tanerko Emery, owned by Ffos Las chairman Dai Walters, after the favourite Oscara Dara weakened tamely.
However, Tanerko Emery had to settle for third spot as Peckhamecho made his bid for glory only for Medinas to sweep past and score by a length and a quarter and a neck.
Wayne Hutchinson made the most of the ride on the Alan King-trained 6-1 winner as stable jockey Robert Thornton preferred Balder Succes in this valuable limited handicap.
"He travelled and jumped well. I found myself in front from the back of the third-last, which wasn't ideal where I was," Hutchinson told At The Races.
"I was floating down to two out, then Nick (Scholfield on Peckhamecho) has got a run on me down the far side, so I gradually worked my way across to give him something to aim at. He put his head down and stuck on really well.
"He has come back a fresher horse today after his break and has done the job. I've half let the race unfold as I was there soon enough three out."
Speaking from Sandown, King added: "To be honest, there's nothing between them on the ratings.
"I did say to Choc (Robert Thornton) 'which one do you want to ride?', but we both agreed he should be on Balder Succes. He was disappointing, I don't think he stayed.
"I think Medinas is qualified for the Pertemps Final and I'll also put him in the Coral Cup." Medinas was quoted at 20-1 with Paddy Power for the Coral Cup at Cheltenham.
19 June 2013
Perfect Annecdote at AscotGodolphin swoop for Libertarian
Doyle hits treble top on Rizeena
Doyle fits the bill in Hunt Cup
Toronado pointed towards Goodwood
O'Brien keeps faith in Camelot
Kazeem crowned Prince of Ascot
Cambridge Dun and dusted
Perfect Ten in Jersey
Plenty of rain needed for Approval
Banoffee pencilled in for Haydock
Classic rematch in Coronation
Guest has excellent chance
Brittain sweet on Rizeena
Team O'Brien hope for perfect Ten
Chigun aiming for Cambridge glory
Camelot bids for redemption
O'Neill ace proves too sharp
Ballydoyle in command in Coventry
Dawn delivers in thriller
Sole powers to sprint glory
O'Brien sounds War cry
18 June 2013
Stevens is king of the CastleAl Thani snaps up Sandiva
Minute's silence remembers Cecil
Duntle on Cambridge duty
Alive and Just in Ribblesdale mix
Passage heads Gold field
Deegan considers Soprano options
Toro out for Palace glory
Cecil's words not lost on Ponsonby
Dawn out for Palace redemption
Hawkwood supplemented for Hardwicke
Flotilla To Drop Back In Trip
Cecil's Chigun in Cambridge action
Al Kazeem and Camelot clash again
De Kock hoping to make history
War ready for Royal Ascot battle
Kingdom set to reign over Ascot
17 June 2013
Magician set for Palace showdownCat clings on for Carroll
Three more winners for Lady Cecil
Monaghan delivers on Midnight
Treve in stunning Diane win
Sapphire target for Trees
Beckett mulls Secret options
Nicholls has broken wrist
16 June 2013
Songbird aiming to fly highMovie has Newmarket on radar
Fahey juveniles primed for action
Stubbs leads O'Brien Coventry team
Salsify on summer break
Kempton target for Benbulben
Top trio head Palace runners
Shea Shea shoots for Stand glory
Animal heads Queen Anne field
Saint-Cloud aim for Dunaden
Magician to be declared for Palace
Soul all heart in York sprint
Kingsgate rules Musselburgh
Sam too sharp for rivals
Hughes makes it pay with Knight
Balding on mark with double
Morawij in a hurry in Scurry
Bartley is queen for a day
Big guns to clash in Coronation