Williams breezed through the first set and then relied on her powerful serve in the second. She did not face a break point in the entire match, only losing nine points on her serve.
Silva sent a shot wide to set up two match points for Williams, who converted the first one when her Portuguese opponent netted a backhand.
Williams is looking for her third Wimbledon title, while the 154th-ranked Silva was making her main draw debut.
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