She had won the 2018 USA Indoor Track and Field Championships with a jump of 6.88 m (22 ft 6+3⁄4 in), ranking third among jumpers before the event.
With just one centimetre less was emerging athlete Khaddi Sagnia, who had equalled the Swedish record in February.
As winner of the IAAF World Indoor Tour, Germany's Sosthene Moguenara-Taroum received a wildcard entry.
In the second round, Sosthene Moguenara moved into second place with a 6.85m which would be her best of the day.
First Reese moved into the lead by equalling Španović's 6.89m, also holding the better second best jump tiebreaker.