Serena Williams is undoubtedly one of the greatest tennis players of all time. She dominated the sport for more than two decades, winning 23 Grand Slam singles titles, five WTA Finals trophies and four Olympic gold medals.
Although the American is famed for producing her best tennis on the biggest stages, she faltered on a few occasions against lower-ranked players. With that in mind, here are 10 players who upset Williams at Grand Slams.
