CARLSBAD, Calif. — Maria Sharapova is realistic as she tries to regain her form after a 15-month drug suspension.

“I think no road is easy,” Sharapova said Sunday before a World Team Tennis match.

Sharapova played for the Orange County Breakers in their season opener against the San Diego Aviators. It was Sharapova’s first appearance in the U.S. since testing positive for meldonium at the 2016 Australian Open.

She returned to the court in April and played three tournaments in Europe. In her first event, the Russian star reached the Porsche Tennis Grand Prix semifinals. A thigh injury prevented Sharapova from competing in the grass-court season that ended Sunday at Wimbledon. But now she’s fit and ready for a summer run, hoping to cap it at the U.S. Open.