Free-agent center Bismack Biyombo has agreed to a two-year, $6 million contract with the Toronto Raptors, league sources told Yahoo Sports. Biyombo joins forward DeMarre Carroll as the second free agent to agree to a deal with the Raptors this week. Together, Biyombo and Carroll – who agreed to a four-year, $64 million deal – are expected to play a part in reshaping the Raptors' defense next season. Toronto general manager Masai Ujiri and coach Dwane Casey want a tougher, more physical roster. - See more at: http://sports.yahoo.com/news/sources--bismack-biyombo-contract-074216426.html