A first-half goal by Dennis McLaughlin saw Hearts knock hot-shots Manchester United out of the NI Youth Milk Cup at the Coleraine Showgrounds.
United will now play another big casualty Sporting Lisbon in the subsidiary BT Cup after the Portuguese lost 1-0 to Dublin side Belvedere.
Also into the Premier quarter-finals are the Japan national side, Preston, Funabashi, Otago and Crew Alexandra.
Hearts will now face Kiwi's Otago after their thrilling victory on Tuesday.
Hearts boss Craig Levine had flown over specially to see his young squad and he was not disappointed.
The winner came in the 33rd minute when McLaughlin drilled home a right-foot shot from 15 yards.
There were mixed fortunes for local county sides in Tuesday's games with Japan ending Co Fermanagh's hopes with a 2-1 victory.
Otago defeated Co Down 2-0 while Co Londonderry went down to a 1-0 defeat at the hands of Jomo Cosmos.
However, Co Antrim defeated Tuks Academy 3-1 with Dominic Melly, Gerard McCabe and Johnny Montgomery scoring.
Co Tyrone defeated Monarcus Morelia with Niall McGinn, Jonathan Lafferty, Brian Patterson and Aaron Monaghan on the scoresheet.
Meanwhile, Goals from Christopher and Jamie McGaharan helped Co Antrim to draw with Stoke City in the Junior Section.
The Potters' youngsters replied through James Phillips and Marc Grocott in an exciting duel at Portrush.
However, there was no luck for Co Armagh who went down 3-0 to Birmingham with Sone Aluko grabbing a hat-trick.
Co Down lost 2-0 to Preston North End with Jonathan Soper on target and Ben Browne scoring an own goal.
Co Londonderry faired even worse when they were hit by 6-2 by Swindon Town with Lukas Jutkiewicz grabbing four goals at Coleraine.
Swindon's other goals were scored by Adam Jones and Joe Fisher with Colin McCay and Ruari Harkin replying for Londonderry.
Co Fermanagh did well to hold former champions Everton to a 1-1 draw Shelbourne saw off Fiji 4-0 with Lee Somers scoring twice and Lorcan Fitzgerald and Dean Carey also on target.
Sporting Club Lisbon v
AIK Stockholm 0-1
Co Armagh 2-3
Co Down 0-2
Otago Youth Soccer
Co Tyrone 4-0
Co Antrim 3-1
Co Fermanagh 2-1
Co Londonderry 1-0
Crewe Alexandra 1-1
Manchester Utd 0-1
Heart of Midlothian
Preston North End 5-0
Sheffield United 1-1
Co Tyrone 0-1 Macabi Haifa
Co Armagh 0-3 Birmingham City
Co Down 0-2 Preston North End
Co Fermanagh 1-1 Everton
Co Londonderry 2-6 Swindon Town
Lourdes Celtic 0-0 Tus Altenberge
Shelbourne 4-0 Fiji
Co Antrim 2-2 Stoke City
St Patrick's Athletic 1-2 Queen of the South
Cherry Orchard 4-0 Parramatta eagles
Co Tyrone 0-4 Charlton Athletic
Dixie 89'ers 0-1 Maccabi Haifa
Home Farm 0-0 Appollon Smirnis