Japanese veteran Kimiko Date-Krumm advanced to the second round of Japan Open after beating a player almost half her age.
The 44-year-old four-time winner in Tokyo, who is currently ranked 160th in the world, beat her compatriot and world number 83 Misaki Doi in their first round match. Date-Krumm won 6-4, 6-2.
Americans Madison Brengle and Christina McHale, the third and sixth seeds, also advanced after recording straight sets victories.
Brengle, who had her breakout performance of the season at the Australian Open, where she reached the last 16, defeated Germany's Anna-Lena Friedsam 6-3, 6-1, while McHale defeated Kazakhstan's Yulia Putintseva 6-3, 7-5.
In the other first round match to be completed on Monday, seventh seed Ajla Tomljanovic fought back from a set down to beat
Hungary's Timea Babos 3-6, 6-4, 7-6 (2).