WTA roundup: Naomi Osaka ends drought on grass

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Naomi Osaka upset No. 4 seed Elise Mertens 6-2, 6-4 in the first round at the Libema Open, notching her first win on grass since 2019 on Tuesday in 's-Hertogenbosch, Netherlands.

Osaka, the former World No. 1 and four-time Grand Slam champion from Japan, fired seven aces and saved the only break point she faced against Belgium's Mertens in the 69-minute victory.

In other action involving seeded players,