FORT MYERS, Fla. — Josh Beckett's back still is feeling stiff.

Boston's ace right-hander had back spasms while warming up Saturday and left the mound before the game against Florida began.

Beckett appears likely to miss the opening trip to Japan for games against Oakland on March 25-26.

Manager Terry Francona says he stressed to Beckett that there is no timetable for him to pitch.