"Mercer made a defensive change which kind of went in our favor, and fortunately for us they never really picked up on it."
Danville outshot Mercer 26-21 overall and 20-10 in the second half.
Jackson scored three times in about six minutes early in the second half, breaking free for goals in the 43rd, 45th and 49th minutes and scoring the tiebreaker in the 73rd minute.
Magana scored in the 46th minute, then missed a chance to give Danville the lead when she missed a penalty kick with about 11 minutes left.
Mercer (0-5) got goals from Chrystal Claunch in the 5th and 12th minutes and one from Chelsea Goodman in the 13th minute against a Danville defense unable to adjust after defender Alyssa Trueblood left with an injury.
"The first 13 minutes, on the left side of our defense we had a problem," Sullivan said.
Cala Alford scored in the 35th minute to give Mercer a 4-0 lead.
Pulaski Southwestern 2, Garrard County 1 - At Somerset, Garrard (2-3) lost a second straight game in the closing moments as Southwestern (2-1) scored with 17 seconds to play.
A Southwestern player found the right corner of the net from 20 yards out to deal Garrard another heartbreaking loss. The Lady Lions lost to Danville two days earlier on a goal with 15 seconds left.
"Who would have thought it could happen again?" Garrard coach Tony Kluesener said.
Southwestern broke a scoreless tie by intercepting a Garrard kickoff at the start of the second half and taking it straight to the goal. Garrard tied the game with about 15 minutes remaining when Brittany Lane scored off Abby Parsons' pass from the corner.
The Lady Lions missed several other opportunities, including a penalty kick that went over the goal and three breakaway chances.
Garrard was outshot 14-10.
"This is a young team, and we are still working on the right combination on the field," Kluesener said.
Boyle County 0, Model 0, tie - At Richmond, Boyle (1-1-2) mounted several scoring threats in the first half but couldn't get a shot into the net against Model (3-0-1).
"I thought we came out a little tired," Boyle coach Brian Deem said. "Our legs were a little tired today, and the ball was in the air a lot, making for a physical game. We were, however, able to mount some good, quality shots in the first half."
Deem said Boyle goalkeeper Tiffany Webb played well in the net, and the Lady Rebels' entire defense was sound as well.
"Tiffany's just playing extremely well right now. Our defense played well all around as a team, but unfortunately we were not able to get a goal in," Deem said.
West Jessamine 3, Boyle County 1 - At Danville, No. 21 Boyle (3-1) fell short in an attempt to rally in the second half against 24th-ranked West Jessamine (4-0).
Boyle coach Greg Conley praised the comeback attempt by his team as it tried to make up a two-goal deficit in the final 40 minutes.
"In all of my years of coaching, I have never been as impressed as I was in the second half of this game tonight," Conley said. "My guys played like absolute gladiators tonight.
"They worked together, believed in each other from the get-go and were knocking on their goal most of the second half. I really believe in my heart if we had just netted one goal, the whole scope of the game would have changed."
All of the goals were on the board by halftime. Boyle, which did not allow a goal in its first three games, gave up two in the first 10 minutes.
"The first half kind of caught us by surprise. They're the strongest team we've played this season," Conley said.
Boyle's Nick Farmwald followed a missed penalty kick with a goal with about 10 minutes left in the first half, but West Jessamine answered with another goal in the last two minutes.
Danville 5, Taylor County 1 - At Campbellsville, Danville (1-3) scored four first-half goals and rolled past Taylor (1-4) to its first win of the season.
Miguel Magana scored twice for the Admirals, who outshot Taylor 16-10.
"I felt like we were pretty much in control ... and played the way we were capable of playing," Danville coach Gary Reynolds said.
Miles Garriott started the scoring 90 seconds into the game, Magana scored in the 11th and 20th minutes and Chris Beto scored off a Jameson Gay assist with 13:30 left in the half.
In the second half, Gay answered Taylor's lone goal with Danville's final tally with 21:30 left.
Chris Booth played his first game in goal for Danville, making five saves and earning his first victory.