This seems to be what they are talking about:

How to Hit Heavier Without Hitting Harder | eHow.com
15 Aug 2009 ... Unless you were raised on a tennis camp, chances are somewhere in your ... Watch the ball: This one is simple, a clean hit is generates more ...
www.ehow.com › ... › Sports › Tennis - Cached - Similar

Patrik Elias Injured After Clean Hit By Ryan Wilson (1/16/10 ...
Avalanche Defensemen Ryan Wilson delivered a clean hit on Patrik Elias 38 ... Wilson commercial, new tennis rackets 2010!!! federer, del potro, lopez ...
www.usdailysports.com/.../83646,Patrik-Elias-Injured-After-... - Cached

teaching tennis - Backhands, Open Stance Backhand Topspin
teaching tennis - tennis players - first serve - second serves, forehands. ... naturally into it with proper timing and rhythmn to accomplish a clean hit. ...
www.teachingtennis.com/site/backhand.htm - Cached - Similar

ON THE JOB / Cary Tennis Salon.com's long-running advice columnist ...
I visited my old friend Cary Tennis. Cary 53 is the advice columnist behind Salon's .... You step up everyday get a nice clean hit and you're done." ...
articles.sfgate.com/.../17251384_1_writing-cary-tennis-work-and-life - Cached

How to increase pace without hitting harder
3) Watch the ball: This one is simple, a clean hit is generates more ... Joe Dinoffer explains to you how to control the direction of your tennis ball. ...
www.articlesbase.com/tennis.../how-to-increase-pace-without... - United States - Cached - Similar
Win With Consistency - How to Play Consistent Tennis
How to play consistent tennis and win more matches. ... precisely enough that your opponent either can't get to them or can't get a clean hit on them, ...
tennis.about.com/library/weekly/aa050800.htm - Cached - Similar

Tennis: Old star reborn with grand desire - Sport - The Independent
Like Boris Becker, Agassi prefers to play his tennis in arenas where elements like sun and ... so you can get a clean hit," he said in the afterglow of that ...
www.independent.co.uk › Sport - Cached