Racing PositionsSource: Cauley-Stein opts out; Mavs to get Burke6YTim MacMahonMavericks G Lee to miss restart with calf injury6YMavs get Porzingis, send Smith, two 1s to Knicks8YTim MacMahonKnicks don't plan to tank but won't trade future assets at deadline9YIan BegleyTrade deadline could be a turning point for sputtering Knicks9YIan BegleyKnicks win first game without Tim Hardaway Jr., but can it last?9YIan BegleyLee, Chalmers fantasy production increase3YBradford DoolittleCeltics acquire Bayless in three-team trade3YWorking the Wire: Late risers3YJosh WhitlingLandman: Post-trade risers3YSeth Landman