Rival Rounds

Actually, everytime I finish a round in FREE PLAY, it says my round is available to others in rival mode to challenge it.

That's how rounds are generated to be challenged in rivals mode.

Rival rounds are only recorded from free play or local multiplayer rounds and every shot you take is saved.

I guess career events were left out because some of them have only 3 holes or special hole orders, and some have gear restictions.

Figured it out. I didn't realize Rivals was it's own separate mode. It doesn't post replays of other rounds. Only rounds you and your friends have played IN Rivals mode. Once you play a round in Rivals, then THAT replay becomes available for others to challenge.
Not rounds from other modes. That's where I got confused.

I don't own an XBox One, but I'm watching the reaction to this game. I'm curious how the so-called "Rivals" mode plays out. If you opt to play a Rivals round, do you have the option to play out a turn-based round using golf's "order of play" rules against
your Rival's character (wichever of the six available they've chosen)? Further, if you play a Rivals round, do you know what the final score is of the Rival before you play the round? That would take too much of the mystery and drama out of it, IMO, if that's
the case.

Any round in free play is available in rivals mode. I confirmed this by creating a 2nd profile, and checking available rounds. It says I have 25 games available.