MELBOURNE, Australia—Ash Barty was front and center when the Australian Open celebrated its inaugural First Nations Day. Albeit not for very long. The top-ranked Barty has Indigenous heritage and her second-round match at Melbourne Park’s main stadium on Wednesday was among the features of a program dedicated to the Aboriginal and Torres Strait Islander people of Australia. She was on and off the court quickly, beating 142nd-ranked qualifier Lucia Bronzetti 6–1, 6–1 in 52 minutes. “Really cool. … Nice for me to be a part of it in a way I feel most comfortable,” Barty said. “On a day when we’re bringing culture together … it was really nice for me to go out and enjoy that. “I was really fortunate to be able to play today.” Barty extended her streak of service holds to 48 games and moved into the third round at Melbourne Park for the sixth consecutive …