On August 4, 1985 — White Sox right-hander Tom Seaver becomes the 17th player in major league history to record his 300th victory when he six-hits New York at Yankee Stadium, 4-1. All of the Bronx Bombers hits are singles.

Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game