Groves will now tackle either Callum Smith or Juergen Braehmer in the final for the inaugural Muhammad Ali Trophy in June.
It didn't stop his enthusiasm but Eubank Jr's accuracy continued to suffer, and "The Saint" responding with wide hooks with left and right both hitting the target.
Groves will be defending his WBO title, with Eubank Jr offering up the rather less respected IBO title.
BC-BOX-Groves-Eubank, 200 Groves beats Eubank Jr to retain WBA super middle beltGeorge Groves has retained the WBA super middleweight belt after outsmarting Chris Eubank Jr by unanimous decision in Manchester Arena.
Groves was also bigger physically, as Eubank only moved up from middleweight a year ago.
Afterwards Groves: 'It was a terrific fight for the fans, well done Chris Eubank Jr; he didn't lie when he said he was going to grit it out.
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The fight will be shown live on ITV Box Office for the price of £16.95. The better man won, but credit to Junior for getting through the match because I hurt him a lot.
Eubank was cut above the right eye in the third round from an apparent accidental clash of heads, and it bothered him for the rest of the fight. "I dropped him at least once but it didn't count, which was dubious", said Groves after the fight.
Although more of the general public are piling in on Groves, it's Eubank Jr who is attracting the bigger stakes.
Your other option is to live stream Groves vs Eubank Jr online via TVPlayer. He cut me. I couldn't see out my right eye.
Eubank touched down at one point, but it was not ruled a knockdown. I think his weakness is his stamina issues whereas Eubank's strength is his stamina.
Sebastian Eubank got his professional career off to a solid start with a points win.
It's hard to say for sure when Groves and Eubank Jr will enter the ring, but as a rough guidance, it's unlikely to be before 10pm, so there's plenty of time to sink a few Saturday night beers in the build-up.