The clash between Toronto FC and DC United was called off shortly before it was scheduled to kick off on Sunday in Orlando, Florida - in the latest COVID-19 incident for the MLS is Back tournament.

The unconfirmed positive test was for a DC United player while a Toronto player returned the inconclusive test.

The match has been rescheduled for Monday with players and staff of both teams to undergo another set of tests as per the league's protocol.

FC Dallas and Nashville were both withdrawn from the now-24 team tournament after numerous players from both sides tested positive for coronavirus.

In West Virginia, some of the world's top tennis players were in action with 2017 US Open winner Sloane Stephens among the winners at the mixed-gender WTT.

The American helped expansion franchise Chicago Smash defeat the Vegas Rollers in the opening clash of this year's competition.

One of only a few live sports to welcome fans in North America amid the coronavirus outbreak, roaring crowds were replaced with masked, socially-distanced spectators at the Greenbrier resort - where the entire three-week WTT regular season will take place.

The event includes several safety measures designed to mitigate the potential spread of coronavirus, including testing for players and regular temperature checks, with WTT allowing a maximum of 500 fans inside the 2,500-capacity stadium.

Australian Associated Press