I particularly like Statistical Inference by George Casella and Roger Lee Berger.
You could also look at Introduction to Probability by Joseph K. Blitzstein and Jessica Hwang (available for free here: http://probabilitybook.net (redirects to drive)).
Should be noted that Casella’s book is… well… really great if you thought Spivak’s calculus and Rudin’s analysis to be fun books, especially the exercises.
You could also look at Introduction to Probability by Joseph K. Blitzstein and Jessica Hwang (available for free here: http://probabilitybook.net (redirects to drive)).