Serena powers into quarters as roof break turns match

By John Stonestreet LONDON (Reuters) - Serena Williams made the most of a break in her match against 13th seed Svetlana Kuznetsova on Monday, when the Centre Court roof was closed after she threatened to sue organisers if she fell and injured herself on the slippery turf. Bidding to equal Steffi Graf's professional-era record of 22 grand slam titles, Williams failed to keep up the momentum and found herself 5-4 down when the Russian broke with a crosscourt backhand winner that left the American