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In a frantic final few hours, free-agent forward Al Horford reached agreement on a four-year, $113 million maximum contract with the Boston Celtics, league sources told The Vertical. Horford had been a four-time All-Star in his nine seasons with the Atlanta Hawks, and his decision to join the Celtics gives Boston a chance to elevate itself in the Eastern Conference. Boston met with Kevin Durant on Saturday in the Hamptons in Long Island, N.Y., and will try to sell Durant on joining Horford in the Celtics' frontcourt.