Rangers ace Yu Darvish to miss season after Tommy John surgery
Darvish exited a spring training game last week with tightness in his arm, but initially it was not believed to be serious.
Darvish, 28, has pitched three seasons in Major League Baseball after playing seven years in Japan.
The three-time All-Star has a career 3.27 ERA with 680 strikeouts and 218 walks over 545 1/3 innings.
The Rangers open the season on April 6 against the Oakland Athletics.