“Jack” Zduriencik (/zɜːrˈɛnsɪk/; born January 11, 1951) is an American radio broadcaster and former professional baseball executive, scout, and player.

Brewers general manager Doug Melvin praised Zduriencik's efforts: "No doubt about it, he deserves almost all the credit for the young players we have.

"[2] In recognition of his success with the Brewers, Baseball America made Zduriencik the first non-GM to receive their Major League Executive of the Year Award in 2007.

Next, during the Major League Baseball Winter Meetings in Las Vegas, Nevada, Zduriencik made a remarkable three-team, 12-player trade that sent star closer J. J. Putz to the New York Mets as well as prospect second baseman Luis Valbuena to the Cleveland Indians.

On December 7, 2013, Seattle Times columnist Geoff Baker wrote a scathing article about Zduriencik, quoting past employees to show that he is difficult to work with.

He is also accused of lying on his original job application that he has an advanced knowledge of and fondness for contemporary baseball Sabermetrics of the Billy Beane mold, knowing that it would be beneficial in getting him hired.

"[7] Asked to respond to accusations by former manager Eric Wedge and Blengino, Zduriencik said: “I am aware of some of the comments of former members of our baseball operations group, and I find them unjust, misleading and one-sided.

"[8] Zduriencik's assertion that advanced metrics have always been part of his office's player evaluation process seems to have been borne out by his 2009 hire of Jeff Kingston to be his assistant general manager.

Club President Kevin Mather expressed confidence that the Mariners were "in position to be a contender for many years to come" and thought Zduriencik was making a "valiant effort".