1971 – The Pirates sweep a doubleheader from the Dodgers, 3 – 2 and 7 – 1, to extend their winning streak to 11 games. In the second game, Luke Walker has a no-hitter until Joe Ferguson homers in the 9th inning for Los Angeles. Pittsburgh is now in front by 11 1/2 games, their largest lead of the year.

This Day In Baseball

On July 18, 1971 — 1971 – The Pirates sweep a doubleheader from the Dodgers, 3 – 2 and 7 – 1, to extend their winning streak to 11 games. In the second game, Luke Walker has a no-hitter until Joe Ferguson homers in the 9th inning for Los Angeles. Pittsburgh is now in front by 11 1/2 games, their largest lead of the year.

Source:
Baseball Reference July 18