Oklahoma City Thunder (3-0, second in the Western Conference) vs. Dallas Mavericks (1-2, 13th in the Western Conference) Dallas; Monday, 8:30 p.m. EDT BETMGM SPORTSBOOK LINE: Thunder -7.5; over/under is 226.5 BOTTOM LINE: Oklahoma City will attempt to keep its three-game win streak alive when the Thunder take on Dallas. Dallas went 39-43 overall and 23-29 in Western Conference action a season ago.