Emilia-Romagna Open: Katerina Siniakova ousts Serena Williams in 2R; Coco Gauff wins

Katerina Siniakova stunned top-seed Serena Williams in the second round of the Emilia-Romagna Open in Parma on Tuesday. The Czech won in straight sets 7-6(4), 6-2 to reach the quarter-final. In the opening set, Williams had a set point in the 10th game on Siniakova's serve but the latter saved it.