The Jacksonville Jaguars had taken a 14-10 lead at halftime of the AFC championship.
The Jags were up 14-3 after an early touchdown pass from Blake Bortles to Marcedes Lewis and a run by Leonard Fournette.
Just before the half, Tom Brady led the Patriots on a six-play, 85-yard drive that included two Jacksonville penalties. The drive ended with a 1-yard touchdown run by James White.
Bortles completed 13 of 15 passes for 155 yards in the half. Brady was 12 of 17 for 124 yards.
The last three times the Patriots have trailed by double digits in a playoff game, they came back to win.
Just before 5 p.m., the Patriots said tight end Rob Gronkowski was questionable to return to the game because of a head injury.
Gronk was left wobbly on a hit from Jaguars safety Barry Church on a downfield pattern late in the first half. Gronkowski headed to the locker room and sat out the remainder of the first half.
He did not appear to be on the New England sideline when the second half began.
Earlier in the second quarter, Gronkowski caught a 21-yard pass that moved him past Dallas Clark for first on the NFL’s all-time list for postseason receiving yards by a tight end, 848.