On June 27, 1955 The Orioles trade 2B Bobby Young to the Indians for IF Hank Majeski.

On June 25, 1955 Miseries plague the Dodger pitching staff. Russ Meyer goes on the disabled list with a broken collarbone, and Carl Erskine has arm trouble.   Source Baseball Reference June 25

Already down six, en route to an 8 – 2 drubbing by Milwaukee, the Dodgers debut Brooklyn-born bonus baby, Sandy Koufax. Working a scoreless but labor-intensive 5th and 6th, Koufax puts Braves on every base—via hit, walk and error (his own)—before recording his first major league out by blowing a 3-2 fastball past Bobby Thomson. Writing more than a decade later, Koufax will recall this undeniably thrilling moment as “probably the worst thing that could have happened to me, getting my first out by striking out a big hitter; because that became my pattern for five years, trying to get out of trouble by throwing harder and harder and harder.” (Conversely, the 4-pitch walk which immediately preceded Thomson—issued to one Henry Louis Aaron—will, in almost the same breath, be viewed by Sandy as “probably the smartest thing I did all year. There have been many times since when I wished I had been wild enough to walk Henry Aaron. I’m usually backing up third as I am wishing it.”)

On June 11, 1955 The Dodgers win their 6th in a row to increase their lead to 10 1/2 games. The lead will not dip below 10 games for the remainder of the season.