The gloves were off!

A Chicago mugger couldn’t have picked a worse person to target as his next victim — an amateur boxing champ who pummeled the crook in the family jewels.

Claire Quinn, a 26-year-old who won the city’s Golden Gloves boxing tournament by unanimous decision earlier this year in her 152-pound weight class, said she was walking through the Bucktown section on Sunday when a man sucker-punched her in the head and demanded her cellphone, Block Club Chicago reports.

Quinn’s fierce boxing instinct took over, she said, responding with a flurry of punches to the man’s groin before he realized he was no match for the heavy right-hander with a 6-0 record this year.

“I just kept throwing my right hand to his balls,” Quinn told the website. “There’s no way to sugar coat that or put it nicely.”

Quinn, who has fought since 2015, said she was on the way to Unanimous Boxing Gym when the attack occurred. A teenage boy first asked her for directions to a nearby Nike store, leading her to say that it was just a block away.

Moments later, Quinn said a second person then approached Quinn from behind and shoved her to the ground and punching her in the head while demanding, “Gimme your phone, b—h!”

With her phone still in her left hand, Quinn then quickly cocked her right arm and let loose, peppering the second suspect’s groin with rapid-fire punches.

“A man hits me, I’m firing back,” she told Block Club Chicago.

The teen ran off as Quinn and the second suspect – whom she described as an adult – continued scrapping before he eventually fled as well.

A pregnant woman who was among of a group of people who saw the attack then ran toward Quinn’s attacker and saw him hop into a green car, possibly a Honda Civic, she recalled.

“I don’t know if her maternal instincts kicked in or what,” she said. “Bless her heart. That’s a lot of cardio.”

Quinn escaped the attack with some bruises and a mild concussion.

No arrests had been made as of Friday.

Investigators said the suspects are approximately 16 to 18 years old and weigh between 140 and 160 pounds, police spokeswoman Kelli Bartoli said.