Mannix: Brad Stevens’ frustration with Marcus Smart could lead to trade

Photo by Douglas P. DeFelice/Getty Images With hours before the official start of free agency on the horizon later today, Sports Illustrated’s Chris Mannix has dropped a bit of a bombshell in Boston regarding newly minted President of Basketball Operations Brad Stevens and the Celtic who played the most years for him, Marcus Smart:

Boston’s acquisition of Josh Richardson could spell the end of Marcus Smart’s run in Boston. Smart has become a fan favorite over seven years in Boston, but Brad Stevens has been frustrated by Smart’s unpredictable play in recent years, per sources.

Mannix notes that the Celtics will look to trade Smart before the start of the 2021-2022 regular season. If you’ve…