Thiem, Venus, Kenin among US Open wild cards
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The US Tennis Association announced the recipients ahead of the August 29 start of the year's final Grand Slam tournament at New York.
Austrian Thiem, the former world number three now ranked 228th, has returned to competition after a long layoff due to a wrist injury.
Williams, 42, has won seven Grand Slam singles titles, including back-to-back US Open titles in 2000 and 2001. She returned to competition after missing nearly a year due to injury.
Her sister Serena, a 23-time Grand Slam singles champion who turns 41 next month, has hinted at retirement after the US Open.
Kenin, the 2020 Australian Open champion, has been ranked as high as fourth in the world but is recently back from an injury layoff and now ranks 412th.