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Cardiff produced a memorable first topflight victory in more than 50 years on Sunday by stunning Manchester City, while Welsh rival Swansea lost at Tottenham.
Fraizer Campbell scored twice to give Premier League debutant Cardiff a 3-2 victory over Man City.
As Cardiff was winning at home, Swansea lost 1-0 at Tottenham.
The blow of Gareth Bale's impending departure to Real Madrid has been softened for manager Andre Villas-Boas by opening the season with back-to-back wins.
Here at home: Platinum Starts beat Bidvest Wits 4-2 in their first-leg, MTN8 semi-final at the Bafokeng Sports Palace.
Orlando Pirates beat Kaizer Chiefs one-nil in their semi-final first leg on Saturday.