Scores update on this site as the umpire taps them in. You do not need an account to watch.
Open the tournament page on this site. Matches that are being played show their score there, and it updates on its own.
You do not need to sign in, and you do not need to refresh the page.
Open a single match to see the score point by point, game by game.
The score appears only while an umpire is entering it at the court. If nobody is scoring that match, the page shows no score.
Open the tournament page.
The organiser usually shares this link. It works for anyone who has it.

Find the match you want and open it.
Leave the page open. The score changes as the umpire enters each point.
You do not need to reload. If your signal drops, the page catches up when it returns.
That match is not being scored on this site yet. It may not have started, or the umpire may be keeping score on paper.
Some organisers show a court board on a screen at the venue. Ask the organiser whether they are running one.