The Boston Red Sox's 15-game run from early July stands as the 2026 MLB season's longest winning streak, with subsequent hot streaks from teams like the Padres, Dodgers, and Cubs limited to eight or nine games. Late-September scheduling, divisional races, and bullpen usage patterns have prevented any club from sustaining momentum long enough to threaten 16 straight wins. Trader consensus pricing at 100% on the 13-15 bracket reflects this established high-water mark and the short runway remaining before the regular season concludes. A late surge by a team with a soft schedule and healthy rotation could still extend the mark, though recent form and historical September patterns make such an outcome unlikely.