Randy Johnson wins 300th | NevadaAppeal.com

Randy Johnson wins 300th

San Francisco Giants starting pitcher Randy Johnson throws against the Washington Nationals during the first inning of a baseball game, Thursday, June 4, 2009, in Washington. (AP Photo/Haraz N. Ghanbari)

WASHINGTON (AP) – Randy Johnson has earned his 300th win, becoming the 24th major league pitcher to reach the milestone.

The Big Unit allowed two hits and an unearned run over six innings Thursday, leading the San Francisco Giants to a 5-1 victory over the Washington Nationals in the first game of a doubleheader.

With his teenage son serving as a Giants batboy, Johnson (5-4) struck out two and walked two in his first attempt at No. 300. The left-hander got his 299th victory last week against Atlanta.

At 45, Johnson becomes the second-oldest pitcher to reach the milestone. Knuckleballer Phil Niekro was 46 when he won his 300th game with the New York Yankees in 1985.

Johnson had been scheduled to pitch Wednesday, but the game was rained out.