At the first meeting of the unit, the Swiss Roger Federer 6: 4, 6: 1 defeated the American Frances Tiafo. The overall result was matched by the American Serena Williams, who beat Belind Benčič 4: 6, 6: 4, 6: 3.
In a decisive confrontation with two eyes, Benčič and Federer surpassed 4: 2, 4: 3 (5: 3) Williams and Tiafo.
The Swiss have both won encounters and the Americans remain without victories.
The winners of the groups are the cup for the title of the tournament champions.
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