Sverrir Gudnason as Björn Borg

Shia LaBeouf as John McEnroe

Stellan Skarsgård as Lennart Bergelin

Tuva Novotny as Mariana Simionescu

Leo Borg as Younger Björn Borg

Marcus Mossberg as Young Björn Borg

Jackson Gann as Young John McEnroe

Scott Arthur as Peter Fleming

Ian Blackman as John McEnroe Senior

Robert Emms as Vitas Gerulaitis

David Bamber as UK Commentator George Barnes

Jane Perry as Kay McEnroe

Roy McCrerey as Björn Borg's Agent #2

Björn Granath as Bengt Grive

Tom Datnow as Jimmy Connors

Colin Stinton as Talk Show Host

Janis Ahern as Psychologist

Bob Boudreaux as Mr. Henderson

Wille Glyt as National Teamplayer #2

Anders Berg as Södertälje Tennis Coach

Iva Šindelková as Borg's fan (uncredited)

Zuzana Geislerová as

Jamie Marshall as British Commentator

Ben Bradshaw as Umpire Wimbledon Final

Mats Blomgren as Rune Borg

Julia Marko-Nord as Margareta Borg

Demetri Goritsas as Björn Borg's agent #1

Jason Forbes as Arthur Ashe

Claes Ljungmark as Mats Hasselqvist

Dag Malmberg as chairman Södertälje

James Sobol Kelly as Phil, John's agent

Thomas Hedengran as Lennart Hyland

Jean Claude Okou as Tabac owner

Felix Engström as tennis coach Stockholm

Annika Ryberg Whittembury as Argentine tv reporter

Inger Järpedal as Mrs. Henderson

David Bowles as french commentator

Richard Drazny as american commentator Butch Waltz

Philipp Schenker as french commentator

Federico Cafaro as Argentinian TV translator

Vincent Eriksson as Brian Gottfried

Val Jobara as Ilie Nastase

Mohamed Shabib as Ismail El Shafei

Igor Tubic as Rod Frawley

Dan Anders Carrigan as Ove Bengtsson

Christopher Fänge as Kjell Johansson

John Runestam as Tenny Svensson