No. 42 has turned 50.

Mariano Rivera, Major League Baseball's all-time saves leader, is celebrating his 50th birthday on Friday. The 13-time All-Star was a member of the "Core Four" with the New York Yankees that won four championships in five years from 1996-2000. He added another title in 2009 to finish with five.

Rivera's legend grew in the postseason, as the right-hander posted a microscopic 0.70 ERA in 96 career appearances, which included a record scoreless streak of 33 1/3 innings.

To honor Rivera's milestone birthday, here are five memories from his remarkable 19-year career with the Bronx Bombers that led to his unanimous induction into Cooperstown.

5. Started in rookie season

The best reliever in the baseball history made 10 starts during his rookie campaign in 1995. They did not go well, as Rivera surrendered 33 earned runs in 50 innings. At 25 years old, he owned a 5.61 ERA before making a permanent switch to the bullpen. The rest, as they say, is history.