Pro tennis players have been wondering aloud whether arm injuries in their sport are related to the week-to-week changing of the tennis balls used by tournaments.

U.S. Open champion Coco Gauff has overcome hard-hitting Czech teenager Barbara Fruhvirtova 6-3, 6-0 to extend her winning start to the year and Auckland Classic defense to the quarterfinals.

Reigning Wimbledon champion Elena Rybakina has pulled out of the French Open before her third-round match on Saturday because she is sick.

Mirra Andreeva is the latest teen sensation in tennis, a 16-year-old Russian who is the youngest player to win a match in the women’s main draw at the French Open since 2005.

Rafael Nadal has started the defense of his Australian Open title with a bit of a struggle along the way to a four-set victory over a cramping Jack Draper.