In tennis betting, the odds change dramatically for a moment, jumping up and down after each break and practically changing after each point. If you’re betting in-play on tennis, I don’t recommend you bet on Next Game, and that’s even more valid for Next Point (of course, not all live bookmakers offer it anyway).
I know online betting professionals who put large amounts of money on such short-term bets, but for me, that’s a bit of pure luck.
For me, it’s worth betting on a tennis player who’s down by one set to win in a three-set match. Of course, in order to make good judgment, it is necessary to know the tennis and mentality of a particular player.