The Dallas Mavericks waived Williams on Thursday, and the five-time All-Star is now looking to join the Cavaliers as they pursue a second straight championship, a person with knowledge of the situation told The Associated Press. [...] the Mavericks resume play after the All-Star break on Friday night in Minnesota sitting in 12th in the Western Conference. Matthew Dellavedova filled that role beautifully for the Cavs during runs to the NBA Finals the previous two seasons, but he left for a big contract with the Milwaukee Bucks last summer. The Cavs have been searching for a suitable replacement ever since, and the lack of one has caused Lue to play James heavy minutes for much of the year. Playing behind Irving will also reduce the physical toll on Williams, who can provide some scoring punch while the Cavaliers await the returns of injured starters Kevin Love and J.R.