The Boston Red Sox's 15-game winning streak from early to mid-July remains the longest of the 2026 MLB season, tying a franchise record and outpacing all other runs such as the Cubs' pair of 10-game streaks and multiple nine-game stretches by the Royals, Phillies, and Rays. No team has matched or exceeded that mark in the ensuing weeks as playoff positioning tightened, with contenders like the Dodgers, Brewers, and Braves posting shorter hot streaks amid heavy schedules and roster management. Trader consensus reflects this pattern, pricing 13-15 games as the clear leader. A late-September surge by a team like the Dodgers on their current form or an unexpected run from a wild-card club could still push the mark higher before the regular season concludes.