The Pittsburgh Pirates win their 10th straight game, edging the New York Mets, 4 – 3, and matching the major-league record to start a season, while the Mets tie a National League record by opening 0-9.

On April 22, 1961 — The Pittsburgh Pirates win their 10th straight game, edging the New York Mets, 4 – 3, and matching the major-league record to start a season, while the Mets tie a National League record by opening 0-9.

Source
Baseball Reference April 22