"Eventually, you have to say it's time," five-time Cy Young Award winner Randy Johnson said during a conference call with reporters Tuesday night.
Last season, "The Big Unit" notched his 300th victory in an injury plagued season with the Giants. Overall, he went 8-6 with a 4.88 ERA.
For his career, the tall lefty compiled a 303-166 record and 4,875 strikeouts, good for second-most in baseball history behind Nolan Ryan's 5,714.
In 2001, Johnson and his slider, "Mr. Snappy", helped lead the Diamondbacks to their only World Series Championship.
Some past links you might enjoy...On the Eve of 300 and 10 Units About Johnson's 300 Victories.