William Charles Renshaw (3 January 1861 – 12 August 1904) was a British tennis player active during the late 19th century, who was ranked world No. 1. He won twelve Major titles during his career. A right-hander, he was known for his power and technical ability which put him ahead of competition at the time.

Renshaw won a total of twelve Wimbledon titles. His record of seven singles titles, which Pete Sampras tied in 2000, was surpassed in 2017 when Roger Federer won his eighth title. The first six were consecutive, an achievement which has been unequaled to this day. His six consecutive singles titles (1881–86) is an all-time record.

Since 1922 the reigning champions have had to play in the main draw, making such feats considerably more difficult. In the summer months he would compete in England and Ireland, while competing on the French Riviera during the winter months and practising on a private tennis court he and his brother had built at their own cost.

In singles play he played his twin brother Ernest Renshaw three times (1882, 1883 and 1889) in the Wimbledon final, triumphing on all three occasions. He was unable to defend his title in 1887 because of tennis elbow, the first time this injury received public attention, and during his absence took up golf. The other five titles were in the Gentlemen's doubles, partnering with Ernest.

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