Rackets, which are approved for play under the Rules of Tennis, must
comply with the specifications in Appendix II. The International Tennis Federation shall rule on the question of whether any racket or prototype complies with Appendix II or is otherwise approved, or not approved, for play. Such ruling may be undertaken on its own initiative, or upon application by any party with a bona fide interest therein, including any player, equipment manufacturer or National Association or members thereof.
Such rulings and applications shall be made in accordance with the applicable
Review and Hearing Procedures of the International Tennis Federation
(see Appendix VI).
Case 1: Is more than one set of strings allowed on the hitting surface of a
Decision: No. The rule mentions a pattern (not patterns) of crossed
strings. (See Appendix II)
Case 2: Is the stringing pattern of a racket considered to be generally uniform and flat if the strings are on more than one plane?
Case 3: Can vibration damping devices be placed on the strings of a racket? If so, where can they be placed?
Decision: Yes, but these devices may only be placed outside the pattern of
the crossed strings.
Case 4: During a point, a player accidentally breaks the strings. Can the
player continue to play another point with this racket?
Decision: Yes, except where specifically prohibited by event organisers.
Case 5: Is a player allowed to use more than one racket at any time during
Case 6: Can a battery that affects playing characteristics be incorporated
into a racket?
Decision: No. A battery is prohibited because it is an energy source, as are solar cells and other similar devices.
USTA Comment 4.1: What happens if it is discovered after play
has begun that a player has been using an illegal racket or an illegally
strung racket? All points played stand. The player must find
another racket before continuing play. A player is subject to code violations
for delay under the Point Penalty System. If the discovery
occurs after the match is over, the match still counts.
USTA Comment 4.2: May a player who breaks a racket or a
string in a racket leave the court to get a replacement? A player who
leaves the Court to get a replacement is subject to Code Violations for
delays under the Point Penalty System. Rule 29b permits a player
"reasonable extra time" to leave the court only in those cases where
"clothing, footwear or necessary equipment (excluding racket) is
broken or needs to be replaced."