NEW YORK -- The New York Yankees and Mets will be allowed to start the season with a maximum 20% capacity.

New York Gov. Andrew Cuomo announced at a news conference Thursday that the Yankees could have up to 10,850 fans for their April 1 opener against Toronto at Yankee Stadium and the Mets could have up to 8,384 for their April 8 home opener against Miami at Citi Field.

Attendees will have to provide proof of immunization against COVID-19 or a negative COVID-19 test. That requirement will be reevaluated in mid-May.

"The numbers are coming down. We have to start moving forward," Cuomo said.

Infection rates in New York City started to fall in mid-January, but the rate has leveled. The city and its surrounding suburbs have among the highest infection rates in the U.S.

Cuomo began allowing fans back during the NFL playoffs with the Buffalo Bills, who drew 6,772 each, about 9.4% of capacity at Bills Stadium in Orchard Park, New York, for games on Jan. 9 and Jan. 16.

"We did testing. It worked extraordinarily well," Cuomo said. "It was a great demonstration. We're now going to move forward."

He announced in mid-February that indoor sports arenas could allow 10% capacity starting Feb. 23, which impacted NBA and NHL teams.

Performing arts will be allowed outdoors starting April 1 with capacities of 20% at venues of 2,500 or more.

Sports venues with 1,500 or more indoors will be allowed 10% capacity and with 2,500 or more outdoors will be allowed 20% capacity. Proof of a vaccine or a negative COVID-19 test will be required.

Contact tracing will be conducted to determine whether anyone who attended got infected.

"I think you're going to see the capacity increase and the testing requirements decrease as we get more evidence. But we want to start safe and smart," Cuomo said.

Former Yankees pitcher CC Sabathia and former Mets and Yankees pitcher Al Leiter attended the news conference along with Yankees president Randy Levine and Mets vice chairman Andy Cohen.

No fans were allowed during the delayed 2020 regular season, which was reduced from 162 to 60 games per team because of the coronavirus.

Fans were allowed only during the postseason at Arlington, Texas, where 75,843 attended the Los Angeles Dodgers' win over Atlanta in the seven-game NL Championship Series and 68,622 attended the Dodgers' victory over Tampa Bay in a six-game World Series.

All teams are expected to have fans for the start of the regular season, and all but Detroit and Houston have made announcements, the baseball commissioner's office said. Only the Texas Rangers will be at 100% capacity.

Other announced capacities, according to MLB, are: Boston and Washington (12%); Seattle (18.9%); the Chicago Cubs and White Sox, Los Angeles Angels and Dodgers, Oakland, Philadelphia, Pittsburgh, San Diego, and San Francisco (20%); Arizona, Baltimore, Miami and Milwaukee (25%); Minnesota (25.9%); Cincinnati, Cleveland and Kansas City (30%); St. Louis (32%); Atlanta (33%); Tampa Bay (40%); and Colorado (42.6%).

Because of Canadian government restrictions, Toronto will play its first two homestands at TD Ballpark, its spring training home in Dunedin, Florida, where capacity will be 15%. The Blue Jays played home games last year at their Triple-A farm team's stadium in Buffalo, New York.