Boston is 2-5 in its last seven games and has been a major disappointment this season. The Celtics, though, acquired Evan Fournier at the trade deadline and could start to make a move. They showed that by upsetting the Bucks, 122-114, on the road Friday night. 
Oklahoma City is 2-1 in its last three games, but is in clear rebuild mode. The Thunder just lost their leading scorer and best player, Shai Gilgeious-Alexander, indefinitely with plantar fasciitis in his right foot. 
So if this were a long-term prognosis, I clearly would buy Celtics stock and drop any Thunder stock. But it's not. This is just a one-time thing and this particular situation favors Oklahoma City. 
Fournier is likely to make his Boston debut here. Moritz Wagner, another Boston newcomer, has just joined the rotation. So there's going to be a transition period. Boston just played two tough games against the Bucks, coming off a huge win that may have turned around its season. The Celtics have a bigger challenge on deck returning home to host emerging superstar Zion Williamson and the Pelicans in a revenge game on Monday.  
The Celtics are 1-11 ATS in their last 12 games following a victory. They are 0-6 ATS the past six times when playing without rest. 
The Thunder have been idle since Wednesday. Their young players are anxious to get back on the court to show what they can do. They should be up for this game. Boston won't. It's a flat spot for the Celtics.