<P> A recent rule change is to allow coaching on court on a limited basis during a match . This has been introduced in women 's tennis for WTA Tour events in 2009 and allows the player to request her coach once per set . </P>
<P> A recent rule change is to allow coaching on court on a limited basis during a match . This has been introduced in women 's tennis for WTA Tour events in 2009 and allows the player to request her coach once per set . </P>
in which year was the on court coaching introduced
in which year was the on court coaching introduced
2009
2009