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It is interesting to point out. I was at first thinking it maybe based on statistics. It does seem strange that this is a common match-up. Perhaps we are just in a point of history where it is more common than not that these two teams face each other in the big show. For example, while they may not have been facing off in the World Series (WS) in recent years, the Yankees and the Dodgers have a pretty long history of playing each other in the WS. Check this out:
The first time they met in the WS was in 1941. Since then, they have played each other 11 times in the WS since.
Total: 11 (‘41, ‘47, ‘49, ‘52, ‘53, ‘55, ‘56, ‘63, ‘77, ‘78, ‘81)
Check out the how consistently close the years are. But, the last time they faced each other in the WS was in 81.
So, perhaps, we are in one of those points in history where there is a Cavs/Warriors dynasty, a trend. I'm sure in the next 5 to 10 years, there will be another. Perhaps the Bulls will finally recover.