However, four others were introduced to Pat Fenlon's line-up - Paul Hanlon, Ian Murray, Martin Scott and Victor Palsson - after the Easter Road outfit were held 1-1 at home to Inverness in their last fixture.
Guernsey made a number of changes in the second half but Northern Ireland doubled their lead through Martin Murray's second penalty, after Conor Rosato was again brought down in the area.
The championship will feature eight of the world's top 12 players: Rafael Nadal, Novak Djokovic, Andy Murray, Juan Martin Del Potro, Andy Roddick, Fernando Verdasco, Jo Wilfried Tsonga and Marin Cilic.
Seeded third in the absence of Novak Djokovic, Andy Murray and Juan Martin Del Potro, the world No. 6 saved two match-points as he clinched his 20th ATP Tour title in Doha.
He had hoped to make his British debut on a Hatton Promotions bill at Bolton on 16 July, against defeated Martin Murray for his vacant Commonwealth crown, but the proposed deal fell through.
Becker's other tips to make an impression are U.S. Open champion Juan Martin Del Potro and fifth seed Andy Murray of Britain, who has yet to win a grand slam.
CNN: Becker tips Nadal and Serena to retain Australian titles
The Spaniard will next play either world No. 1 Novak Djokovic or Juan Martin del Potro, who eliminated third-ranked Andy Murray on Friday.
CNN: Wozniacki seeks 'check mate' in final against Sharapova
Murray's quarterfinal opponent will be Berlocq's compatriot Juan Martin del Potro after the 2009 U.S. Open winner breezed past veteran German Tommy Haas 6-1 6-2.
Kilkeel still have Down All Ireland Minor winner Martin Clarke and are coached by Stephen McVeigh, who was Murray's assistant last season.
BBC: SPORT | Northern Ireland | Gaelic Games | Mourne rivals face MacRory clash
Serbia's Djokovic was beaten by Murray in the semifinals of the Olympics and lost the playoff for bronze to Juan Martin Del Potro of Argentina.
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