There's nothing more satisfying than heading back to a former employer and putting one over your ex-paymaster... even if you cop a pearler of a black eye for your troubles.
Quins led 25-15 at half-time as Roberts, Zach Mercer and Joe Cokanasiga crossed, with Danny Care and Joe Marchant replying for Quins.
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Mercer and Cokanasiga notched their second scores after the break to put Bath 37-18 ahead.
After Semesa Rokoduguni was sin-binned, tries from Joe Marler and Charlie Mulchrone set up a tense finale but Bath hung on.
But Wales and British & Irish Lions legend Roberts ended the game with a nasty shiner...
