Serena Williams moved past the halfway mark in her quest for a rare calendar year grand slam and Novak Djokovic clicked smoothly back into gear as the 129th Wimbledon Championships opened for business yesterday. World number one Williams, 33, has the Australian Open and French Open under her belt this year and her bid for a sixth Wimbledon crown began with a 6-4, 6-1 victory over Russian debutante Margarita Gasparyan.Williams was warned for an audible obscenity when trailing 3-2 but soon transferred her aggression into some belting winners to overwhelm the world number 113.Only two women in the professional era have won all four grand slams in the same year - Margaret Court in 1970 and Steffi Graf in 1988 - but 20-times major singles champion Williams is closing in.Djokovic elected not to play any warm-up tournaments on grass prior to arriving in southwest London but the 28-year-old defending champion quickly found his feet on the slick Centre Court turf against Germany's Philipp Kohlschreiber and sauntered through 6-4, 6-4, 6-4.Fourth seed Maria Sharapova, the 2004 champ, won 6-2, 6-2 over Britain's Johanna Konta.Kevin Anderson, the world number 14, has withdrawn his eligibility for the Davis Cup. He wrote in his blog for supersport.com that he was "indefinitely unavailable", citing issues with Tennis SA. ..