Professional players clearly understand their potential and limitations.  They know how hard they should loop, where to loop, when to loop, and when not to loop.  Ma Long loops most of his balls with 60-95% power.  His selection on how hard to loop depends on his positioning, his distance from the table, his opponent’s return, and his opponent’s positioning.   Timo Ball loops most of his balls with 40-80% power; this is the zone that he feels most comfortable playing.
 
Now, let’s move the scenario to YOU…

When you serve, return serve, or hit any shot throughout a table tennis match, your opponent will have a variety of choices on how to return the ball.  You need to prepare yourself for the worst-case-scenario then adjust if he does something easier.
 

Character must come as the highest priority in table tennis, before winning. Table tennis players must give their best at all times, yet still remain honest and have excellent sportsmanship throughout the table tennis match.

Picture this: You are playing the most important table tennis match of your life in the final round, crowds have gathered, big money is at stake, you are preparing to serve, the score is 9-9… should you call timeout?
The question above could be answered “YES” or “NO” depending on the circumstance. In the above situation, you should possibly call timeout if:
1. You need to consult your coach. If you are unsure on what to serve or what strategy to use, ask your coach.