Tony Clark remains hopeful that Major League Baseball will play games in some way in 2020.

"I'm a glass half-full guy anyways," the executive director of the Major League Baseball Players Association told USA Today. "But as I sit here on April 15, Jackie Robinson Day, I continue to remain optimistic that the possibility of playing still exists."

Clark had a 30-minute phone call last week with MLB officials discussing the reported Arizona plan.

"Everything centers around two things," Clark said. "The amount of testing available and a vaccine. And how it can be mitigated in the public arena as much as the professional arena. And it can't be at the expense of public testing."