In 1993, for Rosenblatt's 15th fight, he wore a pair of trunks with the Star of David symbol sewn into them, harkening back to the legendary Jewish fighters of the 1930s like Benny Leonard and Barney Ross who started the practice. Today those trunks are on display in Philadelphia at the National Museum of American Jewish History.
He started garnering serious attention after his first round KO of "The Irish Express," Sean Fitzgerald, 29–2–2, for the New England Middleweight Title on December 16, 1993. He then beat Frank Savannah, 15–1–1, by TKO for the World Boxing Council Continental Americas Middleweight Title. Next, he met Chad Parker in 1995 for the WBC Continental Americas Middleweight Title. Rosenblatt knocked out Parker in the first round.
His only professional loss came when 5-time former champion Vinny Pazienza knocked him out in the 4th round during a 1996 fight. In the opinions of some, it was a foul punch because the ref stepped between them to break, facing and blocking Rosenblatt, whereupon Pazienza reached around with a punch which knocked out the unprepared Rosenblatt. There was extreme animosity shown by Pazienza in the lead-up to the fight.
At a press conference to announce a rematch, Pazienza's comments included demeaning references that even extended to Rosenblatt’s manhood. Rosenblatt later beat Pazienza in the 1999 rematch in a split decision, winning the vacant International Boxing Organization Super Middleweight Title.
During Rosenblatt's fight against Glenwood Brown in January 1997, he broke his hand. Rosenblatt won the fight, but spent the next 14 months recuperating before he could box again.
On September 25, 1998, he defeated former 3-time WBC super welterweight champion "Terrible" Terry Norris in a unanimous 12-round decision, to capture the International Boxing Association World Middleweight Title.
He defeated Will "Kid Fire" McIntyre, 36–4–1, in October 2000. Then, a torn right shoulder rotator cuff, a separated left shoulder and torn labrum, a hand fracture, and several scheduling problems kept him inactive and caused him to drop out of the world rankings. He did not fight again until June 28, 2002.
He retired from boxing in August 2003. He retired with a record of 37–1–1 (23).
He was notable for being one of the few Jewish boxers active in the 1990s.
Career after boxing
Rosenblatt represents Countrywide Home Loans as a Home Loan Consultant in Peabody, MA, working with realtors, builders, real estate investors, and home buyers. He has attained a top ranking as a loan officer.