Freddie Highmore as Dr. Shaun Murphy, a surgical resident with autism and savant syndrome. His savant abilities include near-photographic recall and the ability to note minute details and changes. He is portrayed in flashbacks to his teen years by Graham Verchere. Nicholas Gonzalez as Dr. Neil Melendez: Attending Cardiothoracic surgeon in charge of surgical residents. He is also engaged to Jessica Preston until episode 12. Antonia Thomas as Dr. Claire Browne, a surgical resident who forms a special connection with Shaun. Chuku Modu as Dr. Jared Kalu, a surgical resident from a wealthy family. Beau Garrett as Jessica Preston: The hospital in-house attorney and Vice President of Risk Management. She is the granddaughter of the hospital founder and a friend of Dr. Glassman. Hill Harper as Dr. Marcus Andrews, Chief of surgery and board member. Richard Schiff as Dr. Aaron Glassman, President of the San Jose St. Bonaventure Hospital, who has been a mentor and good friend of Shaun since he was 14. Tamlyn Tomita as Allegra Aoki, Chairman and Vice President of the foundation that controls the hospital.

Based on this passage, who plays dr murphy in the good doctor? Let's think fast. Stream of consciousness:
To answer this question, we should know that: Freddie Highmore as Dr. Shaun Murphy, a surgical resident with autism and savant syndrome. So the final answer is Freddie Highmore.