Rosenblum Cup is an Open Teams event held every four years as part of the World Bridge Championships. The event was added to the world championships in New Orleans in 1978 to commemorate Julius Rosenblum, who served as president of the World Bridge Federation (WBF) until 1976. A similar event for women, the McConnell Cup, which takes place alongside the Rosenblum Cup was added in 1994.

The full name of this championship is World Open Knockout Teams. The knockout format pertains only to the late stages, however, evidently a six-round knockout with 64 teams in recent renditions. It appears that the field has been divided into sixteen groups for round-robin play, with the top four advancing from each group to the knockout stage.^{[citation needed]}

Year, Site, Entries		Medalists
1978 [1] New Orleans, USA 15 teams	1.	Frenkiel Marian Frenkiel, Andrzej Macieszczak, Janusz Połeć, Andrzej Wilkosz, (Leonard Michniewski)*  (Poland)
	2.	Chagas Pedro Paulo Assumpção, Sérgio Barbosa, Marcelo Branco, Gabriel Chagas, Gabino Cintra, Roberto Taunay  (Brazil)
	3.	Hamman — Bob Hamman, Dan Morse, Cliff Russell, Curtis Smith, Eddie Wold, Bobby Wolff  (USA)
		Chemla — Paul Chemla, Michel Lebel, Christian Mari, Michel Perron  (France)
1982 [2] Biarritz, France 129 teams	1.	Schemeil Albert Faigenbaum, Michel Lebel, Dominique Pilon, Philippe Soulet  (France)
	2.	Martel Ed Manfield, Chip Martel, Peter Pender, Hugh Ross, Lew Stansby, Kit Woolsey  (USA)
	3.	Andrews Allan Graves, Sami Kehela, Eric Kokish, George Mittelman, Eric Murray, Peter Nagy  (Canada)
1986 [3] Miami Beach, USA 25 teams	1.	Robinson Peter Boyd, Robert Lipsitz, Ed Manfield, Steve Robinson, Neil Silverman, Kit Woolsey  (USA)
	2.	Mahmood Nishat Abedi, Nisar Ahmed, Jan-e-Alam Fazli, Zia Mahmood, (Mohamed Zakaris)**  (Pakistan)
	3.	Fallenius Björn Fallenius, Magnus Lindkvist, Mats Nilsland, Anders Wirgren  (Sweden)
1990 [4] Geneva, Switzerland  179 teams	1.	Ludewig Jochen Bitschene, Bernard Ludewig, Georg Nippgen, Roland Rohowsky  (Germany)
	2.	Moss Drew Casen, Charles Coon, Mike Moss, Michael Seamon  (USA)
	3.	Stein — Boris Baran, Arno Hobart, Martin Kirr, Eric Kokish, George Mittelman, Mark Molson  (Canada)
		Rapee — Russ Ekeblad, Dan Morse, George Rapée, John Solodar, Ron Sukoneck, John Sutherlin  (USA)
1994 [5] Albuquerque, USA 119 teams	1.	Deutsch Roger Bates, Seymon Deutsch, Gaylor Kasle, Chip Martel, Michael Rosenberg, Lew Stansby  (USA)
	2.	Otvosi Cezary Balicki, Piotr Gawryś, Krzysztof Lasocki, Adam Żmudziński, (Marek Borewicz, Ervin Otvosi)**  (Poland)
	3.	Levit — Dani Cohen, Avi Kalish, Yeshayahu Levit, Leonid Podgur  (Israel)
		Auby — Daniel Auby, Tomas Brenning, Tommy Gullberg, Mårten Gustawsson  (Sweden)
1998 [6][7] Lille, France 233 teams	1.	Angelini Andrea Buratti, Massimo Lanzarotti, Lorenzo Lauria, Antonio Sementa, Alfredo Versace, (Francesco Angelini)*  (Italy)
	2.	Chagas Marcelo Branco, João Paulo Campos, Gabriel Chagas, Miguel Villasboas  (Brazil)
	3.	Lindkvist — Björn Fallenius, Peter Fredin, Magnus Lindkvist, Mats Nilsland  (Sweden)
		Bramley — Bart Bramley, Drew Casen, Steve Garner, Sidney Lazard, Bill Pollack, Howard Weinstein  (USA)
2002 [8][9] Montreal, Canada 160 teams	1.	Lavazza Norberto Bocchi, Giorgio Duboin, Lorenzo Lauria, Alfredo Versace, (Guido Ferraro)*  (Italy)
	2.	Munawar Taufik Gautama Asbi, Franky Karwur, Henky Lasut, Eddy Manoppo, Denny Sacul, Robert Parasian Tobing  (Indonesia)
	3.	Burgay Cezary Balicki (POL), Leandro Burgay (ITA), Michał Kwiecień (POL), Carlo Mariani (ITA), Jacek Pszczoła (POL), Adam Żmudziński (POL)
2006 [10][11] Verona, Italy 173 teams	1.	Meltzer Roger Bates (USA), Geir Helgemo (NOR), Tor Helness (NOR), Kyle Larsen (USA), Rose Meltzer (USA), Alan Sontag (USA)
	2.	Henner Peter Bertheau (SWE), Peter Fredin (SWE), Christal Henner (USA), Marc Jacobus (USA), Magnus Lindkvist (SWE), Fredrik Nyström (SWE)
	3.	Yadlin Eldad Ginossar (ISR), Avi Kalish (ISR), Melih Özdil (TUR), Leonid Podgur (ISR), Doron Yadlin (ISR), Israel Yadlin (ISR)
2010 [12][13] Philadelphia, USA 144 teams	1.	Diamond Fred Gitelman, Eric Greco, Geoff Hampson, Brad Moss, Brian Platnick, capt. John Diamond  (USA)
	2.	Nickell Bob Hamman, Ralph Katz, Zia Mahmood, Jeff Meckstroth, Nick Nickell, Eric Rodwell  (USA)
	3.	Zimmermann Fulvio Fantoni (ITA), Geir Helgemo (NOR), Tor Helness (NOR), Franck Multon (FRA), Claudio Nunes (ITA), capt. Pierre Zimmermann (FRA)
2014 [14] Sanya, China 123 teams	1.	Mazurkiewicz Marcin Mazurkiewicz (captain), Piotr Gawryś, Stanisław Gołębiowski, Krzysztof Jassem, Michał Klukowski, Włodzimierz Starkowski  (Poland)
	2.	Monaco Pierre Zimmermann (captain), Fulvio Fantoni, Geir Helgemo, Tor Helness, Franck Multon, Claudio Nunes  (Monaco)
	3.	Diamond — John Diamond (captain), Eric Greco, Geoff Hampson, Brian Platnick (USA); Sjoert Brink, Bas Drijver (Netherlands)
		Ventin — Juan Carlos Ventin Camprubi (captain, Argentina); Sabine Auken, Roy Welland (Germany); Johan Upmark, Frederik Wrang (Sweden)
2018 Orlando, USA 97 teams	1.	Zimmermann Piotr Gawryś, Michał Klukowski (Poland), Geir Helgemo, Tor Helness, Franck Multon, Pierre Zimmermann (Monaco)
	2.	Lavazza Alejando Bianchedi (Italy), Dennis Bilde (Denmark), Norberto Bocchi, Giorgio Duboin, Agustin Madala, Antonio Sementa, Maria Teresa Lavazza (n-p capt.), Massimo Ortensi (coach) (Italy)
	3.	Allfrey — Alexander Allfrey, Edward Jones, Thomas Paske, Andrew Robson (England)
		Spector — Vincent Demuy, John Hurd, John Kranyak, Warren Spector (captain), Gavin Wolpert, Joel Wooldridge (USA)

* Michniewski in 1978, Angelini in 1998, and Ferraro in 2002 did not play enough boards in order to qualify for the title of World Champion^{[citation needed]}

** Zakaris in 1986 and Borewicz–Otvosi in 1994 did not play enough boards in order to qualify for second place^{[citation needed]}

• World Open KO Teams 1978–present (table) at the World Bridge Federation