Serena Williams wonders why she and her sister Venus have played on Court 2 at Wimbledon — instead of Centre Court or Court 1.

Four-time Wimbledon champion Serena says tournament organizers "like to put us on Court 2 — me and Venus — for whatever reason."

She adds: "Maybe one day, we'll figure it out."

The defending champion won her second-round match on Court 2 Thursday. Five-time champion Venus won there Monday.

Tournament spokesman Johnny Perkins says there's no intentional snub.

Rafael Nadal, Roger Federer, Novak Djokovic, Andy Murray and Andy Roddick have had all of their matches scheduled for Centre Court or Court 1.

Says Serena: "Yeah, they're never moved across."

The Williams sisters have combined to win nine of the last 11 Wimbledon singles titles.