San Francisco Giants' manager Gabe Kapler, right, watches pitcher Drew Smyly pitch during a baseball practice on Friday, July 3, 2020, in San Francisco. (AP Photo/Ben Margot)

Oakland Athletics pitcher Sean Manaea wears a mask, but slung low, during baseball practice Thursday, July 9, 2020, in Oakland, Calif. (AP Photo/Ben Margot)

Milwaukee Brewers' Corbin Burnes throws during a practice session Monday, July 6, 2020, at Miller Park in Milwaukee. (AP Photo/Morry Gash)

San Francisco Giants pitcher Johnny Cueto, foreground, throws to bullpen catcher Taira Uematsu during a baseball practice in San Francisco, Sunday, July 5, 2020. (AP Photo/Jeff Chiu)

Oakland Athletics pitcher Sean Manaea throws during a baseball practice in Oakland, Calif., Saturday, July 4, 2020. (AP Photo/Jeff Chiu)

Oakland Athletics manager Bob Melvin applauds a player during a baseball practice on Thursday, July 9, 2020, in Oakland, Calif. (AP Photo/Ben Margot)

Houston Astros manager Dusty Baker watches during a simulated baseball game Thursday, July 9, 2020, in Houston. (AP Photo/David J. Phillip)

San Francisco Giants pitcher Johnny Cueto runs during a baseball practice in San Francisco, Sunday, July 5, 2020. (AP Photo/Jeff Chiu)

Houston Astros manager Dusty Baker watches during a baseball practice Wednesday, July 15, 2020, in Houston. (AP Photo/David J. Phillip)