The win puts the Mystics back at .500 with momentum.
The Washington Mystics avenged a disappointing loss and improved their position in the Eastern Conference on the same night.
Elena Delle Donne scored 21 points in the Sky win, moving them within one game of the second place Mystics in the East.
New York looked to be cruising to an easy win before a 15-point third quarter lead evaporated and the Liberty had to scramble to hold off Washington 80-76 in overtime in Tuesday night.
Ivory Latta scored 21 points and Kara Lawson added 14 as the surging Mystics moved into second place in the Eastern Conference with a 77-67 win over the Atlanta Dream on Sunday.