No personal locker for world number one in Cincinnati Open

Despite being the defending champion at the tournament, it seems Serena Williams does not have her own  locker at the Cincinnati Open.

The world number female tennis player took to her Instagram to subtly put organisers of the tournament on blast.

"Sooooooooo today they told me no more lockers left for me @venuswilliams and @carowozniacki I am going to share yours lol # #noteanoshade #triggerfingers ," she wrote on  Instagram while sharing photos of the lockers.

She however kicked off her Cincinnati Open with a 7-5, 6-3 victory over Tsvetana Pironkova that made her the first of the top seeds to advance.

Novak Djokovic won his rain-delayed opening match, beating Benoit Paire 7-5, 6-2. Third-seeded Andy Murray and eight-seeded Rafael Nadal also advanced in rain-delayed matches that ended after midnight.

Williams won the Cincinnati tournament for the first time last year, getting one of the few titles that had eluded her.

This year, she's using it as a final tuneup for the U.S. Open, where she'll be the focus as she tries to complete a rare Grand Slam sweep.