Simplify the following text for a Grade 9 native English-speaking person.
Original: She won the 1999 Australian Open with Swiss player Martina Hingis when they defeated Lindsay Davenport and Natasha Zvereva .
Simplified: However , Kournikova won her first doubles Grand Slam title , partnering Martina Hingis . The two defeated Lindsay Davenport and Natasha Zvereva in the final .