US Open: Again Serena defeats Venus to sustain Slam bid

File: Serena

World number one Serena Williams, chasing the first calendar Grand Slam since 1988, advanced to the US Open semi-finals Tuesday by defeating 23rd-seeded sister Venus 6-2, 1-6, 6-3.

Three-time defending champion Serena reached a Thursday semi-final against Italy’s 43rd-ranked Roberta Vinci, who eliminated France’s 40th-ranked Kristina Mladenovic 6-3, 5-7, 6-4.

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