The Cowboys hosted the Saints in their annual Thanksgiving Day game. The Cowboys trailed early with RB Chris Ivory getting a 3-yard TD run, followed by kicker Garrett Hartley getting a 50-yard field goal, and then by Ivory making a 6-yard TD run. The Cowboys cut the lead as kicker David Buehler got a 21-yard field goal, but the Saints replied as Hartley nailed a 45-yard field goal. The Cowboys tried to come back as Buehler hit a 53-yard field goal, followed by Miles Austin getting a 60-yard TD run. The Cowboys trailed further with Hartley making a 28-yard field goal, but took the lead with Marion Barber III and Tashard Choice getting a 1-yard TD run. They failed to maintain this lead when QB Drew Brees completed a 12-yard TD pass to WR Lance Moore.

Based on the above article, answer a question. How many yards was the longest field goal kicked by Buehler?
53-yard