(Reuters) - Twice French Open champion Serena Williams said her struggle to beat Sara Errani in the Fed Cup on Sunday had been a real "eye-opener" as the claycourt season gets into full swing.
World number one Williams eventually prevailed 4-6 7-6(3) 6-3 against the dogged Italian to take her career record over her to 8-0 but the American was not impressed.
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