No March Madness, no Blazer games, no Masters Tournament, no high school playoffs. Silence falls over arenas.

Ben McKeown/AP

Mike Lemcke, from Richmond, Va., sits in an empty Greensboro Coliseum after the NCAA college basketball games were canceled at the Atlantic Coast Conference tournament in Greensboro, N.C., Thursday, March 12, 2020.

The shock waves from the coronavirus outbreak rattled sports for another day as two rites of spring, the Masters and Boston Marathon, were postponed Friday.

There was at least some relief that those events are expected to take place later in the year, unlike the stunning announcement the day before that the NCAA was canceling March Madness, one of the biggest events on the U.S. sports calendar.

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Empty stands at American Airlines Center on March 07, 2020 in Dallas, Texas.

NASCAR and IndyCar reversed course and pulled the plug on racing this weekend, with IndyCar also suspending its season through the end of April/

NASCAR called off Sunday's race at Atlanta Motor Speedway and next weekend's events at Homestead-Miami Speedway. Both events were already scheduled to be run without spectators.

IndyCar was scheduled to open its season Sunday on the streets of downtown St. Petersburg without fans. Formula One also canceled its season opening race in Australia, leaving the first full weekend of global motorsports without a major event.

If IndyCar resumes in May, the season would begin at Indianapolis Motor Speedway first with a race on the road course and then the showcase Indianapolis 500 on Memorial Day weekend.

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Nick Wass/AP

The empty visitors NHL hockey locker room is seen at Capital One Arena in Washington, Thursday, March 12, 2020. The Washington Capitals were to play the Detroit Red Wings later tonight. The NHL is following the NBA's lead and suspending its season because of the coronavirus pandemic.

NHL Commissioner Gary Bettman announced Thursday it is pausing its season, one day after the NBA suspended play after a player tested positive Wednesday for COVID-19.

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Bridgestone Arena sits mostly empty after the announcement of the cancellation of the SEC Basketball Tournament in Nashville, Tennessee. The tournament has been cancelled due to the growing concern about the spread of the Coronavirus.

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The Charleston Civic Center arena sits empty after the West Virginia girls state basketball tournament in Charleston, W.Va., was suspended due to concerns over the new coronavirus.

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The Capital One Arena, home of the Washington Capitals NHL hockey club, sits empty Thursday, March 12, 2020, in Washington.

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Richard Rodriguez/AP

Dickies Arena sits empty after the NCAA college basketball games in the American Athletic Conference tournament were canceled Thursday, March 12, 2020 in Fort Worth, Texas, due to coronavirus concerns.

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A view of the empty AmericanAirlines Arena before the start of an NBA basketball regular season game between the Miami Heat and the Charlotte Hornets on Wednesday, March 11, 2020 in Miami. The Golden State Warriors announced Wednesday they will play games without fans in their San Francisco arena because of the coronavirus. Then the NBA suspended the season altogether.

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Pleasant Hill and Hicks High School play the boys' state championship Class C game in a largely empty Burton Coliseum in Lake Charles, La., Friday, March 13, 2020. Fans were banned from the arena to conform with state mandate prohibiting large gatherings of people, in relation to the coronavirus.

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Fans leave the Sprint Center after the remaining NCAA college basketball games after in the Big 12 Conference tournament were canceled due to concerns about the coronavirus Thursday, March 12, 2020, in Kansas City, Mo.

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The seats are empty at the Amway Center in Orlando, home of the NBA's Orlando Magic, on Thursday, March 12, 2020.

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Gerry Broome

Virus Outbreak ACC Basketball

A few fans sit in a mostly empty Greensboro Coliseum after the NCAA college basketball games were cancelled at the Atlantic Coast Conference tournament in Greensboro, N.C., Thursday, March 12, 2020. The biggest conferences in college sports all canceled their basketball tournaments because of the new coronavirus, seemingly putting the NCAA Tournament in doubt.(AP Photo/Gerry Broome)

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The arena sits mostly empty after the announcement of the cancellation of the SEC Basketball Tournament at Bridgestone Arena on March 12, 2020 in Nashville, Tennessee. The tournament has been cancelled due to the growing concern about the spread of the Coronavirus.

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Security guards stand behind a team bench area at Bridgestone Arena after the NCAA college basketball games at the Southeastern Conference men's tournament were cancelled.

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The seating area at Bankers Life Fieldhouse, Thursday, March 12, 2020, in Indianapolis, after the Big Ten Conference announced that remainder of the men's NCAA college basketball games tournament was cancelled.

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Players with the University of Missouri baseball team wait in the baggage claim area of Chicago's Midway Airport Thursday, March 12, 2020, only to arrive in Chicago and then get notified that the team's SEC Conference opener with Alabama Friday, had been canceled.