Starting from the Knicks game on February 24, the C's embarked on a very tough 9-game stretch which included the West Coast trip. In that span, they went 7-2
At this point they pretty much have the best record in the NBA locked up IMO barring some massive collapse. I predict the C's go 12-5 in their final 17 to finish with a 63-19 record. Even if the top West teams go undefeated from here on out, they aren't better than 62-20. Or even if the C's slip up and finish around 60 wins total, again, the top West teams would have to only lose 1 or 2 games for them to unseat Boston. Don't see that happening.
It's an easy stretch to finish the season with only a few tough ones mixed in (Phoenix, MIL twice, etc.). Should be plenty of opportunities to load manage and rest guys.