Brad Stevens ‘optimistic’ on Jaylen Brown, Celtics supermax extension talks

LAS VEGAS — While the Celtics have been busy playing through Summer League, the much-anticipated question mark has been a different issue. As of now, the Celtics and star Jaylen Brown are expected to agree to a supermax extension sometime in the coming days and weeks. But through the opening days in Vegas, no agreement has been reached by the two sides. The max dollar amount of any supermax extension isn’t up in the air as Brown is eligible for a five-year, $295 million deal. But there have been some...