Lindsey Vonn -- I'm NOT OPPOSED to Dating Tim Tebow

U.S. Olympic skiing champ Lindsey Vonn says she's still not dating Tim Tebow ... but she's definitely open to the idea.

Vonn was out in NYC last night, when she told us she met the Denver Broncos miracle worker at the ESPYs and actually became friends with Tim's brother ... but she insists no relationship has blossomed.

Vonn recently filed for divorce from her husband/manager/coach Thomas Vonn -- and last night, she told us, "I'm single ... I'm totally single."