U.S. tennis roundup: Marcos Giron, Frances Tiafoe win on Day 2
![Frances Tiafoe competes in Tokyo](https://ktvz.b-cdn.net/2021/07/GettyImages-1330521832-1440x810.jpg)
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U.S. singles players got two wins on Day 2 after all four singles entrants who played on Day 1 lost.
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U.S. singles players got two wins on Day 2 after all four singles entrants who played on Day 1 lost.
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