One of the best plays in doubles is the down-the-line, return-of-serve-lob.
If the lob is successful, it either forces your opponents back or makes
them switch sides of the court, and both situations put them on the defensive.
Below is the photographic sequence that we've just diagrammed. Here my partner
lazily watches the lob as it goes over his head. I have to scramble
over to his side of the court to cover the lob and to compound his lazinessand his error, he has not crossed over to cover my side of the court.
Unless I can: 1) drive the ball past my two opponents now planted snugly
at the net--which is unlikely; or, 2) hit an extremely high, deep lob and
strongly encourage (yell) my partner to reposition himself, one side of
court is completely exposed. This does not look good for the home team.