A Wilson '1' tennis ball. Autographed in black marker by Pete Sampras. Materials: Felt, Rubber, Inktennis

A Wilson '7' tennis ball. Autographed in black marker by Pete Sampras. Materials: Felt, Rubber, Inktennis

A Wilson 'Matchpoint' tennis ball. Autographed in black marker by Pete Sampras and Andre Agassi. Materials: Felt, Rubber, Inktennis

A Wilson 'Matchpoint' tennis ball. Autographed in black marker by Andre Agassi. Materials: Felt, Rubber, Inktennis

A Wilson 'US Open 2' tennis ball. Autographed in black marker by Andre Agassi. Materials: Felt, Rubber, Inktennis

A Wilson 'US Open 2' tennis ball. Autographed in black marker by Andre Agassi. Materials: Felt, Rubber, Inktennis

A Wilson '1' tennis ball. Autographed in black marker by Ivan Lendl. Materials: Felt, Rubber, Inktennis

A Wilson '1' tennis ball. Autographed in black marker by Ivan Lendl. Materials: Felt, Rubber, Inktennis

A Wilson '1' tennis ball. Autographed in black marker by Ivan Lendl. Materials: Felt, Rubber, Inktennis

A Penn 'Classic 1' tennis ball. Autographed in black marker by Martina Hingis, possibly during the New South Wales Open, at White City Stadium, Sydney, in 1999. Materials: Felt, Rubber, Inktennis

A Penn '6' tennis ball. Autographed in black marker by Martina Hingis. Materials: Felt, Rubber, Inktennis

A Rawlings 'John Newcombe' tennis ball. Autographed in black marker by John Newcombe. Materials: Felt, Rubber, Inktennis

A Wilson '4' tennis ball. Autographed in black marker by Martina Navratilova. Materials: Felt, Rubber, Inktennis

A Wilson '3' tennis ball. Autographed in black marker by Martina Navratilova. Materials: Felt, Rubber, Inktennis

A Spalding tennis ball constructed in accordance to the 'War Specification'. Materials: Felt, Rubber, Inktennis

A tennis ball contained in original translucent red viscose seal. Inscription: WRIGHT & DITSON/CHAMPIONSHIP/1933/APPROVED BY THE U.S.L.T.ASSN./PERMAWELT. Materials: Felt, Rubber, Ink, Plastictennis

A tennis ball contained in original translucent red viscose seal. Inscription: WRIGHT & DITSON/CHAMPIONSHIP/1933/APPROVED BY THE U.S.L.T.ASSN./PERMAWELT. Materials: Felt, Rubber, Ink, Plastictennis

A tennis ball contained in original translucent red viscose seal. Inscription: WRIGHT & DITSON/CHAMPIONSHIP/1932/APPROVED BY THE U.S.L.T.ASSN./PERMAWELT. Materials: Felt, Rubber, Ink, Plastictennis

A tennis ball contained in original translucent red viscose seal. Inscription: WRIGHT & DITSON/CHAMPIONSHIP/1929/APPROVED BY/ U.S. LAWN TENNIS ASSN. Materials: Felt, Rubber, Ink, Plastictennis

A white-felted tennis ball. Inscription: WRIGHT & DITSON/CHAMPIONSHIP/1934/APPROVED BY U.S.L.T. ASSN./PERMAWELT. Materials: Felt, Rubber, Ink, Plastictennis

An USPTA Pro Penn 3 tennis ball. Autographed with black marker by Ross Case. Materials: Felt, Rubber, Inktennis

A Wilson '4' tennis ball. Autographed with black marker by Pam Shriver. Materials: Felt, Rubber, Inktennis

A Penn '7' tennis ball. Autographed with black marker by Billie Jean King. Materials: Felt, Rubber, Inktennis

A Penn '2' tennis ball. Autographed with black marker by Billie Jean King. Materials: Felt, Rubber, Inktennis

A Penn '6' tennis ball. Autographed with black marker by Billie Jean King. Materials: Felt, Rubber, Inktennis

A Wilson 'US Open 3' tennis ball. Autographed with black biro by Margaret duPont. Handwritten inscription on accompanying card: ALL BEST WISHES/MARGARET OSBORNE DUPONT. Materials: Felt, Rubber, Ink, Papertennis

A Wilson '3' tennis ball. Autographed with black marker by Zina Garrison. Materials: Felt, Rubber, Inktennis

A Slazenger 'Perma-Core' tennis ball. Materials: Felt, Rubber, Inktennis

A Wilson 'Court 1' tennis ball. Autographed with black marker by Anna Kournikova. Materials: Felt, Rubber, Inktennis

A tennis ball still wrapped in its original green cellophane seal. Inscription on ball: WM/SYKES/LTD./.../L.T.A. OFFICIAL BALL/1938. Cellophane is held together with a blue sticker advertising the manufacturer. Materials: Felt, Rubber, Ink, Cellophane, Adhesive labeltennis