On July 12, 2018The Red Sox win their 10th game in a row as they defeat the Blue Jays, 6 – 4, thanks to 5 RBIs by Mookie Betts. He hits a grand slam off J.A. Happ to cap a five-run 4th inning, at the end of an epic 13-pitch at-bat, then adds an RBI single in the 7th as the crowd chants “MVP! MVP!” The Sox have now won 66 games, the most before the All-Star break in team history.
Source
Baseball Reference July 12