No more silly unforced errors, no more lapses in concentration and no more third set fatigue. You took the court against Bill, a player you beat regularly, confidently popped the top of the fresh can of balls and began your road to the trophy. I've been playing two years less than you and I won. This scenario plays out in every tennis club around the world, with people unsatisfied with their games and not understanding why they are not improving. In other words, just because you spend a lot of time on the court does not mean that you are going to get better.
Tennis is a sneaky game in that it's relatively easy to pick up yet extremely difficult to excel in.
Tennis, like any other skill takes time to develop. Believe me, the pro has no idea because there are so many factors involved. Athleticism, fitness, willingness to learn, time to practice are among a few of the variables which will determine the rate of ones progress. There are many others. To get good, club championship good, takes time, practice and a plan.