UpdatedSep 12, 2012 11:01 PM ET

Trailing late in the third quarter of a game they needed to win, the New York Liberty picked up their defensive intensity and ran away from the Washington Mystics.

Cappie Pondexter scored 22 points to lead the Liberty to a 75-62 victory over the last-place Mystics on Wednesday night. Nicole Powell had 15 points and Kia Vaughn added 10 points and 10 rebounds to help New York (13-17) finish 4-2 on a six-game homestand - including two wins against Washington.

The Liberty also moved a half-game ahead of Chicago for the fourth and final playoff spot in the Eastern Conference.

''It was an ugly win, but I'm glad we pulled it out in the fourth quarter,'' Pondexter said. ''We focused a little more, we began to help each other. I thought we rebounded well, forced them to make tough jump shots.''

Pondexter praised Vaughn's play in the final quarter, when the center and Plenette Pierson had eight points apiece to help New York outscore Washington 19-7 in the period. Vaughn had her first double-double of the season.

''I thought she played great down the stretch, she was confident,'' Pondexter said. ''The last two games we actually were talking about that baseline jumper, where she's great at. She focused in on doing it ... especially in the fourth quarter. I'm happy she was finally able to display the kind of basketball she's been trying.''

Monique Currie scored a season-high 24 points for Washington (5-25), which has lost nine straight. The Mystics dropped to 1-15 on the road this season, with their lone win against the Liberty on July 13 in the last game before the league's monthlong Olympic break.

''We played well throughout the game except for the fourth quarter,'' Currie said. ''We got cold and the Liberty were able to take advantage of that.''

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Liberty 75, Mystics 62