In 1991, under the ring name Bruiser Mastino, Halac traveled to Germany to work for the Catch Wrestling Association.

Mantaur entered the 1995 King of the Ring tournament but was pinned by Bob "Spark Plug" Holly in a qualifying match.

[13] At Holiday Hell, Mastino defeated El Puerto Ricano in his final match for the promotion, in which he was jeered with "Mantaur" chants from the always-vocal ECW audience.

[14] Halac then worked in the United States Wrestling Association as Tank, a masked member of The Truth Commission.

[2] He won the USWA Unified World Heavyweight Championship, his first and only wrestling title, on March 15, 1997, after defeating then-champion Jerry Lawler.

[17] Halac returned to the EWP on May 18, 2001, winning a triple threat match against Eric Schwarz and Martin Nolte.

The tour included Alex Shelley, Homicide, Matt Morgan, Lenny Lane and Chad Collyer.

On the first show of the tour, Halac (as Brusier Mastino) teamed with News (as Cannonball Grizzly) as Big O Incorporated in a winning effort against Matt Morgan & Homicide.

[citation needed] He lost to Tito Santana at Pro Wrestling Syndicate in Metuchen, New Jersey on December 7, 2012.

In May 2015, as "The Turkish Terror" Madd Mustafa, he won the American Heritage Wrestling Heavyweight Championship at their inaugural event in Adel, Iowa.

[18] In September 2016, Halac returned to Germany for European Wrestling Promotion where he teamed with Thunder against P. N. News and Christian Eckstein in a no contest.