Major League Baseball released its pandemic-shortened schedule Monday, featuring a tantalizing season opener between the New York Yankees and World Series champion Washington Nationals, even as some teams were still bogged down by coronavirus concerns.

By the time MLB revealed each team’s 60-game slate Monday evening, the Nationals and Houston Astros – last year’s pennant winners – had canceled workouts because of COVID-19 testing delays that one executive worried could endanger the season.

“We got camps being shut down and people going three and four days without tests. You just don’t know what’s going on,” Dodgers star Mookie Betts said. “We have to just figure out the right way to do it.”

Nick Markakis became the second Atlanta Braves veteran to opt out of the season, swayed by a phone call with teammate Freddie Freeman, who has been stricken with COVID-19.

The Texas Rangers said All-Star slugger Joey Gallo tested positive and is asymptomatic. Arizona Diamondbacks outfielder Kole Calhoun also tested positive but feels good, manager Torey Lovullo said.

Opening night on July 23 will feature the Yankees and their new ace, Gerrit Cole, visiting the Nationals. On the West Coast, the Los Angeles Dodgers and Betts, their big offseason acquisition, will host the rival San Francisco Giants.

Everybody else will be in action by the next day – in ballparks without fans. Teams will play only their division rivals and teams in the corresponding geographic division in the other league.

One quirk of the 60-game schedule is that division foes will play 10 times each, but not necessarily five times in each city. For instance, the Yankees and Red Sox will play seven games in the Bronx but just three in Boston.

The schedule was a bright spot on an otherwise shaky day in baseball’s reboot following a shutdown of more than three months. The steady stream of players testing positive and opting out is leading to a growing unease that the full season might not be played.

“Sixty games looks pretty good on paper, but when you go through it day by day, it gets more difficult to kind of see that, the end of the finish line,” Minnesota Twins catcher Mitch Garver said.

“There’s a ton of players out there quoted saying this, but it almost feels like you’re waiting on bad news, right? You’re just waiting on somebody’s camp to break out. You’re waiting for travel restrictions to be shut down across the nation. You’re waiting for a second wave, where things become unplayable and sports take a backseat. We’re all just kind of going day to day right now, making sure that we’re ready for the given day and looking forward to that.”

The Nationals and Astros were idled after not receiving test results from Friday. That came a day after Washington reliever Sean Doolittle criticized slow test results and a lack of some personal protective equipment.

“Without accurate and timely testing, it is simply not safe for us to continue with summer camp,” Nationals general manager Mike Rizzo said. “Major League Baseball needs to work quickly to resolve issues with their process and their lab. Otherwise, summer camp and the 2020 season are at risk.”

MLB said in a statement that 95% of its intake testing had been completed and the Utah laboratory it’s using had reported 98% of results, a majority of those a day after samples were collected. MLB said it addressed delays caused by the holiday weekend, doesn’t expect them to continue and commended teams for canceling workouts.

But it’s clear that players, managers and coaches have a lot more to worry about than just getting in shape and rounding out rosters.

“You get around the cage and you know you’re not supposed to be touching the cage,” Marlins manager Don Mattingly said. “You have this mask on all day, which is quite honestly cumbersome when it’s hot and you’re working. But it’s something you get used to. When you’re out there and guys are working, it looks exactly the same. You totally forget about it. You can get past it, for sure.”

Mattingly said he tries to be as careful as possible before and after workouts: “You go to touch a door and you’re like, ‘If I can open that without actually having to grab it,’ you’re trying to do that. That’s everywhere now. All the stuff we’re having to do everywhere in the world, especially in the South Florida area where it has been rough lately, that’s what we’re trying to do here.”

The 36-year-old Markakis joined Braves teammate Felix Hernandez in opting out. Dodgers pitcher David Price, Washington infielder Ryan Zimmerman and Colorado outfielder Ian Desmond are among the other players who have opted out.

Markakis said he talked to Freeman, a four-time All-Star, a few days ago.

“Just hearing him, the way he sounded on the phone, it was tough,” Markakis said. “It was kind of eye-opening. With everything that’s going on, not just with baseball but all over the world, it makes you open your eyes.”

Milwaukee Brewers shortstop Luis Urias and pitcher Angel Perdomo tested positive for coronavirus prior to the intake screening and are asymptomatic.