Great servers have realized that power and pace are not the end-all and be-all, and that their killer shots must be backed up with a solid return game.

I know that I play better when I play more tennis so I was like ... Second and third set I couldn't touch the ball. Full power, everything in - I didn't know what to do. 'He plays like this ...

"I know that I play better when I play more tennis so I was like ... "Second and third set I couldn't touch the ball. Full power, everything in -- I didn't know what to do.

"I know that I play better when I play more tennis so I was like ... "Second and third set I couldn't touch the ball. Full power, everything in -- I didn't know what to do.

Photograph: Francis Mascarenhas/Reuters "I know that I play better when I play more tennis so I was like ... "Second and third set I couldn't touch the ball. Full power, everything in -- I ...

“I know that I play better when I play more tennis so I was like ... “Second and third set I couldn’t touch the ball. Full power, everything in — I didn’t know what to do.

“I know that I play better when I play more tennis so I was like, ‘Why play one-hour-30 (minutes), minimum three hours to feel my shots better,” joked last year’s finalist. “Second and third set I ...

If you're a serious tennis player and you plan on playing three or four days a week, the Penn Championship tennis ball is an ...

Fritz is far from the only player on the ATP Tour who is unhappy with the quality of tennis balls over the past few years.