Tennis scoring is so unfair compared to other sports. Player can win most points or most games and still lose.

In most other sports, it is limited time and who ever scores the most wins. It is test of skill.

Examples of unfair match in Tennis.
6-1 6-7 6-7. Player A who wins 18 games vs 15 loses.

Even within a set.
Game 1. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0
   Score 1-0
Game 2. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 7 points vs 5
   Score 1-1
Game 3. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0 Net 11 points vs 5
   Score 2-1
Game 4. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 14 points vs 10
   Score 2-2
Game 5. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0  Net 18 points vs 10
   Score 3-2
Game 6. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 21 points vs 15
   Score 3-3
Game 7. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0 Net 25 points vs 15
   Score 4-3
Game 8. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 28 points vs 20
   Score 4-4
Game 9. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0  Net 32 points vs 20
   Score 5-4
Game 10. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 35 points vs 25
   Score 5-5
Game 11. 40-0 plus 1 by Player A. Player A wins Total 4 points vs 0 Net 38 points vs 30
   Score 6-5
Game 12. 40-40 Plus 2 by Player B. Player B wins. Total 3 points vs 5 Net 41 points vs 35
   Score 6-6
Game 12. Tie breaker 7-5 Player B wins. Total 5 points vs 7 Net 46 points vs 42
   Score 6-7

Player who won 46 points vs 42 loses.

Why is this?