Bath lost Freddie Burns and Tom Homer to early injuries, but nevertheless edged ahead at Kingston Park when Ruaridh McConnochie crossed following an early penalty from veteran Newcastle fly-half Toby Flood.
However, the hosts soon responded through a converted Johnny Williams score and Flood added two further three-pointers in the second half after Bath’s Josh Bayliss had been yellow-carded.
In Friday’s other contest, tries from Nick Schonert and Ryan Mills helped Worcester climb above Bath and up to sixth.
FULL-TIME | Worcester Warriors 20-13 Harlequins
Four in a row at Sixways ? pic.twitter.com/YUy9yzBV3J
— Worcester Warriors ?? (@WorcsWarriors) November 23, 2018
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