The Boston Celtics have agreed with Center Robert Williams on a contract extension. This confirmed its Agent Kevin Bradbury by Rep1 Sports espn S Adrian Wojnarowski on Friday. Accordingly, the 23-year-old signs a four-year contract of over $ 54 million, which promotes him to the upper middle field among all centers. Williams grew in the Celts in the past three years in an ever-greater role and stood past season twelve times in the starting five. The Time Lord, whose nickname results from his sleepy presentation press conference and his missed flight to the Summer League in his rookie season, pointedly indicated that he could become an important factor for the Celtics on both sides of the square. NBA - today's star centers in their rookie season: Not every beginning is difficult NBA: Williams with career cables It is effective in the offensive and a good ring protector on the other side, and he brings good passals. Only its litter from the distance is not yet available. I...