head to head
Grand Slam Tennis 2 asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
Stick-controlled tennis testing swing timing and percentage shot selection.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Grand Slam Tennis 2 leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Grand Slam Tennis 2 leans clearly harder on execution.
Grand Slam Tennis 2
Total Racket Control stick swings demand precise timing
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Grand Slam Tennis 2 leans clearly harder on reads.
Grand Slam Tennis 2
Versus humans, disguising shot placement is genuine prediction
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Grand Slam Tennis 2
Ball physics are nearly deterministic
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Slam Tennis 2
Shot selection and court positioning follow learnable percentages
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.