On July 15, 1969 Reggie Smith collects five straight hits in the opener, stretching his hitting streak to 21, and leading the Boston Red Sox to a 7 – 6 win over the New York Yankees. He gets another hit in the nitecap, a 4 – 1 win by New York’s Stan Bahnsen (5-10), but his hit streak will stop tomorrow.
Source
Baseball Reference July 15