| 31 Aug 18 | r01        | Cardiff BluesCardiff Blues | 32 - 33 | LeinsterLeinster |
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| 08 Sep 18 | r02        | BenettonBenetton | 27 - 25 | Cardiff BluesCardiff Blues |
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| 15 Sep 18 | r03        | ZebreZebre | 26 - 24 | Cardiff BluesCardiff Blues |
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| 21 Sep 18 | r04        | Cardiff BluesCardiff Blues | 37 - 13 | MunsterMunster |
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| 28 Sep 18 | r05        | Cardiff BluesCardiff Blues | 24 - 21 | CheetahsCheetahs |
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| 06 Oct 18 | r06        | DragonsDragons | 15 - 23 | Cardiff BluesCardiff Blues |
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| 27 Oct 18 | r07        | CheetahsCheetahs | 21 - 10 | Cardiff BluesCardiff Blues |
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| 04 Nov 18 | r08        | Cardiff BluesCardiff Blues | 37 - 0 | ZebreZebre |
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| 23 Nov 18 | r09        | GlasgowGlasgow | 40 - 15 | Cardiff BluesCardiff Blues |
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| 01 Dec 18 | r10        | UlsterUlster | 16 - 12 | Cardiff BluesCardiff Blues |
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| 21 Dec 18 | r11        | Cardiff BluesCardiff Blues | 19 - 16 | DragonsDragons |
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| 31 Aug 19 | r01        | Cardiff BluesCardiff Blues | 32 - 33 | LeinsterLeinster |