I finally saw this film last night and really enjoyed it. The actors did a fine job and it really gives a glimpse into the minds of these two iconic greats, as well as tennis of around 1980.
For those unfamiliar with the movie, it is centered around their 1980 Wimbledon final, although half the film is biographical flashbacks for both players. The film follows both, although the emphasis seems slightly more on Borg. I also loved the depiction of Vitas Gerulaitis.
If the film is accurate, it painted a picture of Borg that I wasn't fully aware of: that he was really quite tightly wound and had an immense routine to keep his emotions under check. The film implies, if not outright states, that he retired so young mostly because he simply couldn't stand the intense pressure anymore - but it was an internal pressure to keep his emotions in check.
There was a point in the film where his coach, Lennart Bergelin, said something to the effect that Borg wouldn't be able to handle not being the best, that he would completely collapse when he slipped. This implies that even if he had played on, with McEnroe surpassing--as he did by 1981--he might not have won that much more. But we'll never know.
Anyhow, it was nice to see an actually good tennis film. Battle of the Sexes, also from 2017, was also quite good. Other than that, not much out there (I suppose Wimbledon was cute).
My only complaint about the film is that I didn't love the actual tennis scenes. I'm used to watching actual matches, or highlights of actual matches, and these were obviously staged, without much really good action. I'm not sure how they could have done it otherwise, but it was very "set proppy," if that makes sense.
Highly recommended. I just love the scene near the end, in the airport - very touching.