Former champion bombs out in first round upset

Former French Open champion Garbiñe Muguruza has lost her opening match at Roland Garros to 18-year-old Marta Kostyuk of Ukraine, 6-1 6-4.

Muguruza received treatment for a back issue between sets and made a slew of aggressive errors, as though eager to end rallies quickly.

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She won the tournament in 2016, won Wimbledon in 2017 and was seeded 12th. It was her first opening-round exit at the French Open.

Kostyuk, ranked 81st, earned her first win over a top 20 player.

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