Serena Williams serves her way to victory in fourth round of U.S. Open

On Sunday, Serena Williams fell back on her faithful serve to defeat Kaia Kanepi, whacking 18 aces and pulling out the round of 16 match, 6-0, 4-6, 6-3, on Arthur Ashe Stadium to advance to her 15th U.S. Open quarterfinal, where she will face Karolina Pliskova. (Credit: Newsday / Yeong-Ung Yang)