NEW YORK (AP) — The next woman who must deal with the daunting task of playing Serena Williams at the U.S. Open, Ajla Tomljanovic, considers herself an admirer of the 23-time Grand Slam champion. “I’ve been a Serena fan,” Tomljanovic said, “since I was a kid.” Tomljanovic, an Australian who is 29, will face Williams, who turns 41 next month, for the first time on Friday night — in front of what is sure to be another exuberant and partisan full house — in the third round at Arthur Ashe Stadium. “She kind of has that aura, like Roger (Federer), Rafa (Nadal), and deservedly so,” Tomljanovic said.