In 2012 she caused a stir when she reached the last sixteen at the French Open with a narrow three-set win over former title winner Francesca Schiavone . There came the end against the number 4 seed Petra Kvitová (2: 6, 1: 6). Nevertheless, Lepchenko climbed to number 51 in the world rankings . In Wimbledon, she also reached the third round in 2012, in which she again lost out against defending champion Kvitová with 1: 6 and 0: 6. This was followed by a quarter-finals in Carlsbad (three-set defeat against Nadja Petrowa ) and a round of 16 participation in Montreal (three-set defeat against Caroline Wozniacki ). At the US Open, where she was in the third round of a Grand Slam tournament for the third time in a year, she had to admit defeat to defending champion Samantha Stosur . Her good results brought her to 19th place in the WTA ranking, her previous record.
The year 2013 turned into a “double year” together with Zheng Saisai . At the Australian Open , they reached the semi-finals, in which they had to let the local heroes Casey Dellacqua and Ashleigh Barty go first in two sets. At the French Open they were stopped in the quarterfinals by the eventual finalists Sara Errani and Roberta Vinci . In June Lepchenko consequently reached 40th place in the double world rankings. In Wimbledon and at the US Open, the two were eliminated against strong opponents in the second round.
In 2013 Lepchenko first played for the US Fed Cup team ; their Fed Cup record shows so far 2 wins in 1 defeat.