Plenette Pierson added 10 points for New York (8-9). Pondexter scored 14 points in the final 12:15 as New York rallied from a 13-point deficit late in the third quarter.
Fowles' running jumper gave the Sky a 45-32 lead, matching their biggest of the game, with about 3 minutes left in the third quarter. Chicago made just four field goals and scored nine points the rest of the way.
Pierson then had a layup and Pondexter made a jumper and a 3-pointer from the left corner to pull the Liberty within six. Kalana Greene opened the fourth quarter with a jumper and Pondexter made a layup to get New York to 45-43 with 8:07 left.
Pierson's layup with 4:38 to go tied the score at 47, and Pondexter hit a 3 to give the Liberty their first lead since midway through the first quarter.
After Perkins hit a 3 to tie the score again, Pondexter's fadeaway jumper with 2:23 left gave the Liberty the lead for good.
Mistie Bass made a layup with 7.2 seconds left to pull the Sky to 56-54. Taj McWilliams-Franklin made a free throw less than a second later to push New York's lead to three, and former Liberty star Erin Thorn missed a potential tying 3 in the final second.
Perkins and Fowles scored five points each as Chicago went on a 14-0 run to take a 20-10 lead with about 2 1/2 minutes left in the first quarter.
Pondexter's pull-up jumper on the ensuing possession ended the Liberty's scoring drought of nearly 3 minutes during which they missed three shots and had two turnovers, including a shot-clock violation.
Perkins scored 15 points in the first half, including the Sky's final eight points of the second quarter, to help Chicago take a 35-26 lead at halftime. Fowles had 12 rebounds.
Pondexter led the Liberty with 16 points on 5-for-5 shooting from the field and 4 for 5 from the free-throw line.
Source: AP News