SF Gate: Johnson wins #300

My prediction for the next 300 game winner: Andy Pettite

Randy Johnson cut his teeth as a Montreal Expo, became a star as a Seattle Mariner and won a championship as an Arizona Diamondback. All of that, though, had been relegated to the musty pages of a history book when the Big Unit wrote one of his most defining chapters Thursday.

Johnson became the 24th pitcher and sixth left-hander in major-league history to win his 300th game, in a 5-1 victory against the Washington Nationals, and did so as a San Francisco Giant.

Johnson pitched six dominating innings and watched the bullpen get the last nine outs in the opener of a doubleheader that was scheduled after Johnson’s start Wednesday night was rained out. The game was far tenser than the final score