As Mariano Rivera prepares to retire the closer's farewell tour has become a central subplot to the season. Major League Baseball's all-time saves leader has been greeted warmly in each of his road stops and the Yankees are planning a ceremony of their own to honor Rivera's illustrious career in September.

Rivera will be the last active player to regularly wear uniform No. 42 with the number having been retired throughout MLB in 1997 to honor the achievements of barrier-breaking great Jackie Robinson. During his 19-year big league career Rivera has also chiseled his own mark on the number's legacy. In honor of Rivera and his contributions MLB.com is commemorating 42 notable moments from Rivera's career -- the 42 Days of Mo.

History will remember Mariano Rivera for his work in the ninth inning of course -- for mowing down opposing batters and efficiently locking down the final three outs with ease.

It's almost bizarre to recall then that Rivera didn't finish the game in his Major League debut. He started it.

Rivera's first moment in the Major League spotlight came in the first inning as a 25-year-old starting-pitching prospect for the Yankees. That was the way Rivera made his Major League debut starting against the then-California Angels on May 23 1995.

Rivera threw 3 1/3 innings that night and took the loss the first of a career defined by saves and Yankees victories. He gave up five runs on eight hits and three walks striking out five. He was hardly the efficient hurler he'd grow to be needing 89 pitches to record 10 outs.